Question

Consider the preparation of acetylsalicylic acid (aspirin), by reacting salicylic acid with acetic anhydride. A reaction...

Consider the preparation of acetylsalicylic acid (aspirin), by reacting salicylic acid with acetic anhydride.

A reaction was performed in which 2.05 g of salicylic acid was reacted with an excess of acetic anhydride in the presence of phosphoric acid to make 1.82 g of acetylsalicylic acid (aspirin).

Calculate the theoretical yield and percent yield for this reaction.

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Answer #1

The molar mass of salicylic acid is 138.12 g/mol.
2.05 g of salicylic acid corresponds to moles .
The reaction of 0.0148 moles of salicylic acid with excell acetic anhydride will give 0.0148 moles of acetylsalicylic acid.
The molar mass of acetylsalicylic acid is 180.16 g
0.0148 moles of acetylsalicylic acid corresponds to of acetylsalicylic acid
Theoretical yield of acetylsalicylic acid = 2.67 g
Percentage yield of acetylsalicylic acid %

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