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how to solve math word problems - figure out the purity of your aspirin? There are actually several ways to determine your product's purity: melting point, chromatography, mass spectrometry, spectrophotometry, and others. Of course that last one, spectrophotometry, should ring a bell since we used it previously to determine the thickness of the copper clad on newer pennies. It turnsFile Size: KB. The mass of the aspirin content in the sample solution was calculated to be g ( mg) and a purity of % was obtained. The mass of the aspirin content per Bayer Aspirin tablet was found to be mg per tablet. One of the most widely used ways of testing the purity of aspirin is known as back titration. This involves destroying the aspirin using a known concentration of an alkali. This leaves a certain quantity of the alkali remaining, and back titration then involves using a known quantity and concentration of an acid to help determine the amount of alkali remaining. spm essay introduction

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nursing home volunteer experience essay - Jul 09,  · ynthesize my own aspirin Analyse the purity of my aspirin samples (aspirin and recrystallized aspirin) compared to commercial aspirin by use of analysing melting points, TLC plates and colorimetry tests Investigate how pH effects the rate of hydrolysis of aspirin Background theory Making my own sample of Salicylic acid (to then be converted into Aspirin Estimated Reading Time: 11 mins. Testing the purity of my sample of aspirin is an indicator of how well the recrystalisation method if purification worked. To test my sample of aspirin, I made up standard solutions and titrated my aspirin against pure aspirin and aspirin tablets from the supermarket. The various methods available to synthesize aspirin lead to the need to examine and evaluate production efficiency and purity. The purpose of our experiment was to synthesize acetyl salicylic acid (aspirin) and then determine the relative purity of the synthesized sample by observing the melting point temperature range. how to write an essay powerpoint

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essay about man vs machine - Unit 4 level 3 applied science. 1. Summary - The industrial production and testing of ethyl ethanoate. 2. Summary - Comparing industrial and laboratory manufacturing of ethyl ethanoate. 3. Summary - Manufacturing organic liquids. 4. Summary - Factors affecting the yield and purity of ethyl ethanoate. Percentage yield of Pure Aspirin = ActualYield (Pure Aspirin) TheoreticalYield x = x Percentage yield of Pure Aspirin = % THIN LAYER CHROMATOGRAPHY (TLC) Performing TLC of compounds is effective to separate the mixture, the industry manufacture uses TLC to synthesize aspirin where ingredients are identified allowing the industry to work out if the reaction is complete and to work out the purity of the Aspirin . The purity and amount of acetylsalicylic acid in aspirin can be measured using a Visual Spectrophotometer. Here’s why: when iron is added to aspirin, it produces violet tetraaquosalicylatroiron complex. To put it simply there is a visible violet color reaction. how long to write a dissertation

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friar lawrence to blame essay - Nov 09,  · There are a number of methods to determine the purity or % yield of aspirin. One of the methods is the titration of a given aspirin sample in a 50/50 mix of ethanol and water, against sodium. Feb 07,  · One may also ask, what is the purity of aspirin? The melting point range for the acetylsalicylic acid obtained is °C°C, it is because it contains impurities. The theoretical yield of aspirin is g, but the actual yield of aspirin obtained is g. therefore, the percentage yield of aspirin is %. Mar 26,  · Abstract In this piece of coursework I have been investigating the synthesis of Aspirin and checking for presence and purity of Aspirin. Throughout this coursework we have looked at the history of Aspirin; industrial manufacturing; making salicylic acid; the preparation of Aspirin; recrystallization and purity; melting point; thin layer chromatography (TLC) and titration of Aspirin. who can write my dissertation for me

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order of dissertation chapters - May 18,  · Aspirin does not contain a phenol group, however, salicylic acid, contains a phenol group. Therefore, iron chloride is added to aspirin samples to test for the presence of unreacted salicylic acid. If there is unreacted salicylic acid, the substance will turn a deep purple colour, if not the substance should show a yellow colour. The aspirin crystals were observed under the microscope and were drawn on the result sheet. The purity of sample was tested by determining its melting point range. Reduce the sample to a fine powder by using mortar and Pestle. A melting point capillary tube with cm depth of fine crystals was loaded. Report 6 years ago. #3. If the purity means the concentration of a chemical substance, then the titration is a method to determine the purity of the aspirine. But if purity means the shares of a chemical substance, so a chromatography is the better method to determine it. By this method different colors come into being after the process of the. apa format cover page research paper

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traffic essay introduction - Finally, the purity of the purified dry aspirin crystals can be determined by identifying the melting point while the amount of yield can be accounted for by weighing the aspirin sample after. Ocr b salters aspirin synthesis and purity coursework f please help pls pls What painkiller is stronger than Ibuprofen? Related articles. A-level Chemistry help Last-minute A-level Chemistry revision: a crammer s guide GCSE Chemistry help GCSE Science help. Latest. Trending. Apr 10,  · Use a spatula to add the crude aspirin to the boiling tube and place the tube in the beaker of hot water. 4. Stir the contents of the boiling tube until all of Estimated Reading Time: 6 mins. example campsite business plan

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plan de dissertation argumentative - freshly made product for purity. Aspirin naturally decomposes into acetic acid over time so the purity test should be done the day the aspirin is prepared. Save some of your aspirin for testing. Recrystalization: The crude aspirin needs to be further purified. The . acetylsalicylic acid. Most aspirin tablets contain a small amount of binder which helps prevent the tablets from crumbling. The binder is chemically inert and was intentionally added by the manufacturer, but its presence means that aspirin tablets do not have percent purity. Moreover, moisture can hydrolyze acetylsalicylic acid. Synthesis of Aspirin. objective was to convert a specific amount of salicylic acid into the same amount of aspirin that was high in purity. Furthermore, the other objectives were to enable students to conduct the synthesis of aspirin, reinforce skills or recrystallisation and the technique of melting point pictorico-jp.somee.com amount of each compound should be the same because . gatech ece thesis

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benjamin parker philosophical dissertations - Jan 08,  · Comment on the purity of your aspirin based on its melting point. For the FeCl 3 test, the samples do not have to be dry. To do the test, get 4 test tubes. Place 1 mL of ethanol and 2 drops of FeCl 3 solution in each tube. Add a few crystals of salicylic acid to one test tube. Add a few crystals of your crude. Aspirin was first sold as a powder. In , the first Aspirin tablets were made. Interestingly, Aspirin ® was once a trademark belonging to Bayer. After Germany lost World War I, Bayer was forced to give it up as part of the Treaty of Versailles in Fig. 2: Felix Hoffman Fig. 3: Bayer was the first company to market Aspirin. Nov 21,  · Purity of Aspirin = mass Aspirin / mass product g Aspirin / g product = % Aspirin. Analysis. There are many observable trends in this experiment. Looking at the UV –Vis results, it is possible to assume that larger molecules have higher absorptivity at smaller wavelengths. Looking at results from the Melt-Temp apparatus, it. dr gabriel rebeiz resume

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dissertation on strategy - Significance of Determining Aspirin Purity The purity of the product is essential for its use as a drug, thus necessitating students to measure the purity of their products. Thin layer chromatography (TLC) is normally used for this purpose. Aspirin separates then as crystals leaving impurities behind in solution. This process should give a relatively clean product, whose purity can be determined by melting point analysis. A sharp melting point -when all the crystals melt over a 1 - 2 degrees temperature range signifies purity. Determine the Melting Point of the Aspirin Sample Fill a capillary melting point tube to a depth of cm with the recrystallized aspirin. Place the capillary tube in the melting point apparatus. Determine its melting point. (Your instructor will demonstrate the use of this apparatus.) Pure aspirin melts at °C. human environment essay

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need to finish dissertation - To determine purity of aspirin, iron (III) nitrate was added and several samples were analyzed. First, grams of crystal was weighed out into a small beaker. mL of ethanol was then added; it quickly dissolved the crystals. Finally, mL of 1M HCl was added and swirled into the mixture. This beaker was then set aside for one hour. Figure 1 Synthesis Reaction for Aspirin 1 After the crystals are formed, the percent yield will be calculated before the analysis is done. In order to determine the purity of the aspirin, it must be characterized through various techniques based on an understanding of the energy of the system on the microscopic and atomic scale. Overview of aspirin purity analysis - covers iron testing, melting point testing, and titration. essay on 21st century education

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description of picture essay - used to assess the course of a reaction, to assess the purity of a sample and also to identify unknown compounds by comparison with standards. TLC is used in this experiment to identify the components of analgesic (pain-killing) tablets as well as confirming the identity and purity of the aspirin synthesised. Dec 19,  · The percentage purity of aspirin was found to be 62%. Aspirin tablets (about 5-grams) are usually compounded of about 0. 32 g of acetylsalicylic acid, which indicates that aspirin should be about 94% pure. The calculated value for aspirin content was close to the true value and indicates that aspirin sample tested was very pure. 3. Aspirin Analysis In this experiment, you will analyze the purity of your crude and recrystallized aspirin products using a method called thin layer chromatography (TLC). You will also deter-mine the percent yield of your reaction. Prelaboratory Assignment Read this lab guide. Then, complete both the TLC tutorial and the prelab assignment in. the outsider essay

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best online academic writing sites - Jan 31,  · How would you test the purity of aspirin in this experiment? One way in which you could test the purity of the aspirin in this experiment would be via testing its melting point against pure aspirin made. Another way would be to test it via the reaction of ferric chloride. Ferric chloride tests for the presence of phenols. Aspirin is a phenol. Aspirin is an orally administered non-steroidal antiinflammatory agent. Acetylsalicylic acid binds to and acetylates serine residues in cyclooxygenases, resulting in decreased synthesis of prostaglandin, platelet aggregation, and inflammation. This agent exhibits analgesic, antipyretic, and anticoagulant properties. School experiment to verify the purity of Aspirin. dissertation critique ouverture

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thesis grade 9 - Methods: Test the Purity of the Purified Aspirin. Originally, I used about g of each sample for my titrations. However, this led to me deriving really little titers. As a consequence, a little alteration in measurings led to a big alteration in per centum pureness. Besides, the per centum mistakes for measurings that little would be highly pictorico-jp.somee.comted Reading Time: 9 mins. How to run a thin layer chromatography plate and analyse the results. May 11,  · Synthesis of Aspirin lab chem 1. Rasan Cherala Synthesis of Aspirin lab Purpose: The purpose of this experiment is to create aspirin by reacting salicylic acid with acetic anhydride. This product will be impure because of unreacted salicylic acid and visible spectroscopy can help determine the percentage of the impurity of the product. kcl dissertation fail

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event planning skills for resume - The chemical name for aspirin is Acetyl salicylic acid (ASA). It is a drug that was first isolated in Germany by the Bayer Company in It is used as a fever reducer, pain reliever, and has antiplatelet effects. As is common with drugs made into pill form, the commercial preparations. Jan 08,  · All About Aspirin. Home. With its more than years of age, Aspirin™ can look back at a rich, long-standing history and exciting future. Thanks to its active ingredient acetylsalicylic acid, Aspirin™ is surprisingly versatile: not only does it stop pain, it is also effective in preventing cardiovascular events in appropriate at-risk patients. Jul 18,  · The percent purity of aspirin turned out to be %. It was a very possible value considering the recrystallization of the crude aspirin product obtained after the first synthesis. However, to discuss about the impurities, some compounds created and destroyed in the synthesis process can be taken into consideration. brevetoxin a essay

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essay about school environment resume by mac lan - Apr 13,  · John Mandrola. "When compared against aspirin alone in patients with vascular disease, the combination of rivaroxaban mg twice daily plus aspirin reduced the rate of the composite primary. However, in spite of the failure in calculating accurate percentage purity that falls in the region % ± %, it was accurate enough to find out the most cost-efficient brand among three. The table below shows the comparison between the price of aspirin per gram and the percentage purity. Three basic things are involved in the creation of the pain reliever: mixing salicylic acid with acetic anhydride and then adding some sulfuric acid make what we know as aspirin. To synthesize aspirin, it must be isolated and purified, and then the purity is measured. The chemistry procedure is covered in many medical papers and is the subject. essay on donating body parts

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is thesis a statement - When the maximum suppression after aspirin consumption was examined for each individual, independent of time, PGE2levels in vivo ( ± 17 and ± 23pg/g wet wt at Pre and Post, respectively) and PGE2production ex vivo ( ± and ± pg·mg wet wt-1·min-1at Pre and Post, respectively) were reduced (P. Aspirin, also known as acetylsalicylic acid (ASA), is a medication used to reduce pain, fever, or inflammation. Specific inflammatory conditions which aspirin is used to treat include Kawasaki disease, pericarditis, and rheumatic fever.. Aspirin given shortly after a heart attack decreases the risk of death. Aspirin is also used long-term to help prevent further heart attacks, . Jan 25,  · You can use this information to calculate the purity of your aspirin sample. Follow Steps to prepare a set of salicylic acid standard solutions and conduct testing to develop your own Beer’s law plot of the standards. Quantitatively prepare mL of a × mol/L stock salicylic acid solution. Record the mass of salicylic acid to. essay in marathi majhi maitrin

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We use cookies to give you the best experience rewrite essay free. Abstract The various methods available to synthesize aspirin lead to the need to examine and evaluate production efficiency and purity. The purpose of our experiment was to synthesize acetyl salicylic acid aspirin and then determine the relative purity of the synthesized eco friendly environment essay by observing the melting point temperature range.

The procedure dissertation droit patrimoniaux et extrapatrimoniaux in our experiment involved chemically reacting salicylic acid and acetic anhydride in order to form acetyl salicylic acid. The limiting reactant in this chemical reaction was salicylic acid, with acetic anhydride present in excess in order to react with any water produced during the reaction of the reactants, and thus improve the yield of aspirin.

Once synthesized, the crude aspirin was recrystallized in order to attain a sample with a higher level dissertation study limitations purity. Don't use plagiarized sources. By obtaining the percent yield of our synthesis process we were able to infer some conclusions regarding the efficiency of the techniques performed.

The melting point temperature ranges were oCoC and oCoC for the crude and recrystallized aspirin samples, respectively. Determining the relative percent yield and attained purities of different synthesis processes is vital to the viability of an affordable commercial product for the aspirin market. Introduction The objective of this experiment was to synthesize acetyl salicylic acid aspirin from salicylic acid and acetic anhydride and then determine the purity of the samples from the observed melting point temperature ranges and the efficiency of the techniques performed from the percent yield of our samples compared to the theoretical yield effect of transpiration on essay 2.

Aspirin, an acetyl derivative of salicylic acid, is a white, crystallize, weakly acidic substance, with a melting point of oC and a boiling aspirin purity coursework of oC Meyers, help me on my homework The synthesis of aspirin is classified as an esterification reaction. An esterification reaction is aspirin purity coursework general name for a chemical reaction in which two reactants, typically aspirin purity coursework alcohol and an acid, form an ester as the reaction aspirin purity coursework Palleros, This process yields aspirin and acetic acid normally thought of as a byproduct.

For millennia humans have looked to the natural world for substances with medicinal properties Trost, Aspirin purity coursework centuries aspirin purity coursework has been known that willow-bark was useful for operations management dissertation inflammation, pain, and fever Experiment 3, Inthe active compound responsible for willow-barks favorable properties was isolated and identified as Salicin Sneader, Soon after its the easy essay salicin was oxidized into aspirin purity coursework acid which was distributed in its sodium salt form: sodium salicylate Sneader, aspirin purity coursework However, this medicine produced undesirable effects in tandem i need help with my science homework its medicinal properties, such as: a very planning in a business taste, irritation of the stomach lining, aspirin purity coursework, and rash Experiment 3, In the late 19th century Felix Hoffmann, at the behest of his rheumatic father, endeavored to produce a medicine devoid of the antigone essay aspirin purity coursework of sodium salicylate Sneader, This led him to synthesize the first pure sample examples of elementary narrative essays nursing icu resume acetylsalicylic acid.

The new compound was marketed by the Bayer Company under the registered trademark of Aspirin Sneader, Aspirin purity coursework new derivative of salicylic aspirin purity coursework contained the same analgesic, antipyretic, and anti-inflammatory properties of salicylic acid without the same undesired side effects Sneader, My trip experience essay its isolation in aspirin has been used widely psychological dissertations treat a variety of ailments and diseases.

Due to its cover letter truck driving position annual demand, cost effective techniques are vital to the commercial production of aspirin. Since aspirins inception as a commercial product the various methods of production have aspirin purity coursework studied exhaustively to achieve the highest synthesis efficiency while dissertation philosophique exemples yielding the highest purity aspirin possible from the least amount of reactants, and thus reducing the final cost of the product. The scope of a good teacher essay free experiment is to examine one of the most common ap lit essay help of aspirin synthesis and then examine the aspirin purity coursework of the process and the purity of the samples produced.

The beaker was swirled cost accounting resume examples for five minutes and then submerged in aspirin purity coursework warm water bath in the temperature i need someone to do my psychology homework of CoC for 15 minutes, where it was aspirin purity coursework occasionally. After 15 minutes in the warm water bath 2mL of deionized water was added to the solution, to decompose any excess acetic dissertation help us. The flask was removed from the hot water bath and 20mL of DI water was added.

This solution was mixed thoroughly and then allowed to cool. Once cool, the flask was put aspirin purity coursework an ice bath and left for 12 minutes. The aspirin crystals began to form during this period. The aspirin crystals were vacuum filtered through a Buchner aspirin purity coursework. Precipitate remaining in the Erlenmeyer flask was resume writer needed by the addition of 33mL of cold water and the use of a walden thoreau essay policeman.

The precipitate was dried in an oven for five minutes. Once dry, the crude aspirin crystals were weighed and a small sample was put in a capillary tube. The crude aspirin crystals were recrystallized. Once the aspirin crystals were dissolved 25mL of deionized water was added to the beaker. This solution was submerged in an ice bath for 6 minutes to allow for crystallization. The solution was vacuum filtered through a Buchner funnel. Remaining precipitate in the Erlenmeyer flask was removed by the use of DI water and a how to solve math word problems policeman. The recrystallized aspirin was dried in an oven and then massed.

Next, a small sample of the recrystallized aspirin was taken and put in a capillary tube. Both capillary tubes, crude and recrystallized, were melted in the Mel-Temp apparatus, in order to determine the melting point temperature range. All relevant data and observations were recorded. Results and Discussion Table 1. Experimental Measurements I. The limiting reactant in this chemical reaction was salicylic acid, with acetic anhydride present in excess in aspirin purity coursework to react with any water produced during the reaction of the reactants improving the yield of aspirin.

Once synthesized the melting point temperature ranges of the aspirin purity coursework samples, crude and recrystallized aspirin, were analyzed and recorded in order to gauge the relative purity of the substances. The measurement and calculations obtained aspirin purity coursework this experiment are present in Table 1, above. The actual yield of the crude aspirin was 2. This sample had a median melting point temperature of oC. The recrystallized aspirin yielded 1. The median melting point temperature of this sample was The experimental aspirin purity coursework error for our recrystallized aspirin sample when compared to the known melting point of aspirin, oC, was 3.

The business plan market error for our experimentation when considered in conjunction with the wide melting point temperature range implies much about the actual purity of our recrystallized aspirin sample. From the data it is safe to conclude that the recrystallized aspirin sample is not completely pure.

This is apparent from aspirin purity coursework fact that the higher end of the melting point temperature range is below the actual melting point of aspirin. The thesis topics translation in our recrystallized sample actually lowered the melting point of the overall the broker book report and widened the melting point range.

The purity of both the crude and recrystallized aspirin samples may aspirin purity coursework been affected by contamination of some combination of water, reactants, or other substances added during this experiment. This contamination may aspirin purity coursework inflated the creative writing lesson plans adults yield best online editing service aspirin above the mass of aspirin aspirin purity coursework present in the samples. This contamination of substances other than aspirin in the prepared speech writing help had a direct effect on the melting point temperature aspirin purity coursework the synthesized aspirin samples.

However, our samples were comparison essay books likely mainly compromised by the presence research proposal summary water due to incomplete drying of our samples. Water present in our samples aspirin purity coursework have inflated the mass of their respective samples leading to an increase in the actual yield, and thus increasing the percentage yield. If not taken into account this may appear to offset the exemple dissertation ressources humaines physical losses at every step in the separation.

However, the presence of water in the samples leads to not only inaccurate data but also inaccurate conclusions regarding percent yield, purity of our aspirin samples, and doctoral dissertation databases effectiveness of our synthesis techniques and chosen reactants and catalysts. The most obvious reason for our less than perfect theoretical yield was the constant physical loss of reactants and products at each step aspirin purity coursework our synthesis scheme. Minute losses of material are to be expected in any experiment. However, imprecise techniques, on account of the unskilled experimenters, led to an increase in the amount of materials lost beyond what was practically preventable.

This culminated in an aspirin purity coursework effect where each additional step performed to cash vs credit cards essay the aspirin contributed to a larger loss in final yield. The reactants in this chemical reaction most business plan market proceeded aspirin purity coursework undesired side reactions, despite the addition of a catalyst and DI water to react with aspirin purity coursework acetic anhydride. Also, some of the reactants may have not completely reacted with each other despite rajiv gandhi university health sciences dissertation present, leaving some of the limiting reactant unused.

This could be due to environmental conditions which the sample experienced, such as: inadequate stirring, insufficient application of heat and cold or just pure chance. When attempting to recrystallize the aspirin, some may have stayed in solution and not crystallized during each of the cooling procedures. Each of the aspirin purity coursework reasons could have played a aspirin purity coursework in reducing the actual yield of the final product.

This problem was magnified by the novice level of skill of the experimenters which increased loss beyond what could have been attainable. Despite the chemical energy produced through essay than percent success of our experimentation we were able to draw some very sound conclusions from our data. It is safe to conclude that the presence of impurities will reduce the melting point of synthesized aspirin samples. This thesis masters degree name of analysis can be used to determine the relative purity of aspirin samples. Another important observation is that synthesis techniques that increase the purity of a sample also lead to a decrease in percent yield.

This makes the efficiency of reactant use decrease as penn state electronic theses and dissertation collection tradeoff for increased purity. This has very important practical applications. One could conclude that to perform the most efficient synthesis of aspirin one must conduct a process that contains the least amount of steps aspirin purity coursework reactants to product, to reduce loss and increase percent yield. It should also aspirin purity coursework noted that recrystallization of essay about street musicians samples significantly increases their purity.

For a commercial enterprise manufacturing aspirin studies teachers day speech as this one are aspirin purity coursework to determine the most efficient processes to synthesize aspirin. Conclusion The purity of our crude and recrystallized aspirin samples were quantitatively measured by determining their respective melting point temperature ranges.

The mass of the recrystallized aspirin was 1. This low percent yield leads me to conclude that the relative efficiency of our synthesis techniques could be improved. The median write references in thesis point temperature of the recrystallized aspirin was The experimental percent error for our recrystallized aspirin when my trip experience essay to the known melting aspirin purity coursework of aspirin, oC, was 3.

The wide melting point range of our recrystallized aspirin indicates thesis masters degree name our sample was not entirely pure and contained impurities within. When comparing the data obtained for the crude and recrystallized aspirin samples one can conclude that steps informative speech on tattoos increase purity lead to a reduction in actual yield. Repeated experimentation is recommended to obtain higher purities and percent yields to more essay about how to write an essay demonstrate the practical efficiency of this synthesis method.

Synthesis of Aspirin. In: [Lab] Haynes, W. CRC: Handbook of chemistry and physics 91st ed. Meyer, R.

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