These questions are based on aspirin synthesis lab! 1. What unwanted reaction wo

Question

These questions are based on aspirin synthesis lab!

1. What unwanted reaction would have happened if the reaction mixture was heated too long when trying to get rid of the organic layer?

a. acetic anhydride would be degraded
b. the product could be converted back to the starting material
c. a & b
d. nothing; heating for a long time would have ensured removal of the organic layer

2. Why was sodium acetate such a lousy catalyst?

a. it cannot activate acetic anhydride
b. it is too weak of a base to pull of the phenolic hydrogen to form the minor anion of salicylic acid
c. the salt will not disocciate once dissolved
d. a & b

3. Why was the acid used a better catalyst?

a. the shift in equilibrium to the minor anion of salicylic acid was more favorable
b. a & d
c. the reaction was more endothermic this way
d. the shift in equilibrium to the protonated form of acetic anhydride was much more favorable

4. Which reagent(s) does the acid activate at the start of the reaction?

a. salicylic acid
b. acetic anhydride
c. a & b
d. another molecule not listed

5. What is the purpose/consequences of recrystallization?

a. to purify the product
b. melting point is increased
c. melting point range is widened
d. a & b

Explanation / Answer

b. the product could be converted back to the starting material

a. it cannot activate acetic anhydride

c. the reaction was more endothermic this way

d. another molecule not listed

c. melting point range is widened

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