Chapter 16, Problem 16.13P

Interpretation Introduction

Interpretation:

Determination of nitrogen in organic compound by standard thiosulfate solution has to be explained. The relationship between moles of ${\text{NH}}_{\text{3}}$ liberated in the process and moles of thiosulfate required for titration of iodine has to be derived.

Concept Introduction:

Kjeldahl procedure is the procedure in which digestion of organic compounds is done by concentrated ${\text{H}}_{\text{2}}{\text{SO}}_{\text{4}}$. The steps include in this process are digestion, distillation, and titration.

Iodometric titration is a type of titration reaction in which iodides reacts with another oxidizing agent in acidic or neutral medium. As a result of this, iodides are converted to iodine and this formed iodine is back titrated against another standard reducing agent (usually sodium thiosulphate) of known concentration.