3.0 g of a sample of impure ammonium chloride were boiled with excess of caustic soda solution. Ammonia gas so evolved was passed into 120 mL of N//2 H_(2)SO_(4). 28 mL of N//2 NaOH were required to neutralise residual acid. Calculate the percentage of purity of the given sample of ammonium chloride.

3.0 g of a sample of impure ammonium chloride were boiled with excess

1.	3.0 g of a sample of impure ammonium chloride were boiled with excess of caustic soda solution. Ammonia gas so evolved was passed into 120 mL of N//2 H_(2)SO_(4). 28 mL of N//2 NaOH were required to neutralise residual acid. Calculate the percentage of purity of the given sample of ammonium chloride.
Answer» SOLUTION :`(120-28) mL N//2 H_(2)SO_(4)-=92 mL N//2 NH_(4)CL`