Question

A student was assigned to recrystallize an impure sample of benzoic acid. he obtained 3.2g of pure benzoic acid from 5g of the sample. calculate the % yield of recrystallized (pure) benzoic acid.

Answer 1

Solution:

% yield = (mass of pure benzoic acid) / (mass of starting benzoic acid)

% yield of recrystallized (pure) benzoic acid = (3.2 g) / (5.0 g) = 0.64 or 64%

Answer: The yield of recrystallized (pure) benzoic acid is 64%.