(2 points) A student performs the ferric chloride test and the result is negativ
ID: 1086157 • Letter: #
Question
(2 points) A student performs the ferric chloride test and the result is negative (there is NO purple color whatsoever). Assuming the student tested his aspirin correctly, does this conclusively prove that the isolated crystals are 100% (or close) pure aspirin? Please give a complete explanation. 1. (1.5 points) A student did not add a magnetic spin vane to their vial during the reaction. However they performed everything else in the procedure correctly (correct temperature, time, etc.). Explain how the percent yield should be affected and why. (Hint: think about collision theory that you learned in CHM152) 2. (2 points) Phosphoric acid is not in the balanced equation for the reaction, yet the lab manual tells you to add it. Why? Why purpose did it serve? What do you predict the effect on the reaction might be if you left it out? 3. 4. (1.5 points) One of the steps in the synthesis of aspirin is OH OH Based on this, which molecule acts as a Lewis Acid and which acts as a Lewis Base? .What is the source of the proton on the carbonyl in acetic anhydride? (1 point) Under certain conditions, when aspirin is exposed to water, it can be hydrolyzed. Define hydrolysis. What are the products of hydrolysis of aspirin (you are allowed to look this up)? If aspirin was hydrolyzed, how would the effect to ferric chloride test (be specific) 5.Explanation / Answer
1) If there is a ferric chloide test negative then it does not have a phenolic -OH group.But aspirin is charactarized then we can tellthat it is not pure.THere is somethng else.
2)The reaction will be slow and the yield will be low.because the spin helps to collide.
3)phosphoric acid is used as catalyst.so it is not coming in equation.
4)salicylic acid lewis base and other one lewis acid.proton comes from phosphoric acid.
5)salicylic acid and acetic anhydride are hydrolysed product.
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