Determination of some organic thio-compounds by precipitation of mercuric sulphide from mercury(II) ammine complexes-I Determination of thioacetamide and thioacetanilide.

A gravimetric method based on precipitation of mercuric sulphide has been developed for determining thioacetamide and thioacetanilide. Concentrated nitric acid is added to 0.1M mercuric nitrate, the solution is made alkaline with concentrated ammonia solution, and thioacetamide (dissolved in water) or thioacetanilide (dissolved in alcohol) is added, and the mixture is boiled. The method has good accuracy, and takes about 40 min.