Synthesis of Aspirin Assignment General Concepts What byproduct is synthesized a
ID: 532529 • Letter: S
Question
Synthesis of Aspirin Assignment General Concepts What byproduct is synthesized along with aspirin in the reaction performed in this lab? Experiment-Specific Questions Experiment I: Synthesis of Aspirin Fill in the table with the results from your lab notes and complete the necessary calculation: Synthesis of Aspirin Results Mass (g) empty flask flask and synthesized aspirin synthesized aspirin Calculate the percent yield using the formula below: % Yield = [g aspirin obtained/ g aspirin calculated (3.91)] X 100 Explain what could cause a less than 100% yield. Experiment II: Test for Salicylic Acid What is indicated by iron(III) chloride changing color? Fill in the table with the results from your lab notes: Test for Salicylic Acid Sample Tested Color with iron(III) chloride acetylsalicylic acid salicylic acid synthesized aspirin empty tube Based on the color of your synthesized aspirin how pure was it?
Explanation / Answer
A major impurity that could be found in the crude product would be unreacted salicylic acid. So bi product of reaction is salicylic acid.
The crude product and the purified product can be tested using ferric chloride. Ferric chloride forms highly colored complexes with phenolic compounds. So when the ferric chloride is added to the product, one can tell if the product mixture contains any of the starting material by the color of the solution. Solutions containing the phenolic group are dark purple and ones without are a yellow color.
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