Question

A 0.5287g of Salicilic Acic with Acetic Anhedride and we obtain 0.4820g of Aspirin. 1) Calculate the Theoric Yield of the Aspirin 2) Calculate the Percent of Yield for the Aspirin    Big THANKS as USUAL

Answer 1

The equation for the reaction is given as,

C7H6O3 + C4H6O3 ----> C9H8O4 + CH3COOH

Salicylic acid + acetic anhydride----> aspirin+ acetic acid

From the equation, we can say that 1 mole of salicylic acid gives one mole of aspirin.

Number of moles of salicylic acid reacting = given mass / molar mass = 0.5287/ 138.121 = 0.003827 mole

Hence, the number of moles of aspirin produced should be 0.003827 mole

Mass of 0.003827 mol = 0.003827*molar mass of aspirin = 0.003827*180.157 = 0.6896 g

1. The theoretical yield is 0.6896 g

2. Percentage yield = (yield / theoretical yield)*100 = 0.482/0.6896 *100 = 69.89%