hood due to its irritating effects on the sinuses. A hot plate was used, so a lo
ID: 556847 • Letter: H
Question
hood due to its irritating effects on the sinuses. A hot plate was used, so a lower setting was used to heat it. Caut was taken to dispose of all chemicals. Purpose: To compare the properties of aspirin to other analgesics Results: Mass of flask Mass of flask and salicylic acid Mass of salicylic acid Possible maximum yield of A. Preparation of Aspirin 94.781 9 6.763 g 42.608 s of watch class1.982 9 (96.7819-94.781g)-1.982 9 2.58 g (1.982 9 x 180)/138 2.589 5.228 g aspirin Mass of prepared aspirin Percent yield Melting point of aspirin product (42.608 g-39.073 9) 5.2289 202.6 % yield-(5 228 g / 2.58 g)-202.6% 138 C B. TestigAspirin Products Color with ECl Dark purple Light purple Samples Tested pH 0.15% salicylic acid Commercial aspirin brand Buffered aspirin 7Light pink White with slight Aspirin from A hint Acetyisalicylic acid Deep purpleExplanation / Answer
Experiment : Preparation of aspirin from salicylic acid
In the above shown experiment, the percent yield of the reaction was found to be much higher.
The melting point of the resulting aspirin sample was also found to be higher than the literature value of aspirin.
This could be due to the presence of unreacted salicylic acid remaining the formed aspirin sample. The color test also proves this conclusion. The melting point of aspirin increased by the presence of apprrciable amount of salicylic acid in the sample. Purification of the sample must be done to remove salicylic acid and melting point for the thus purified sample would then be tested for its purity.
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