Question

write the use of alcohol in the limit test of chlorides in KMnO4​

Answer 1

Principle:

Limit test of chloride is based on the reaction of soluble chloride with silver nitrate in presence of dilute nitric acid to form silver chloride, which appears as solid particles (Opalescence) in the solution.

Procedure:

Test sampleStandard compoundSpecific weight of compound is dissolved in water or solution is prepared as directed in the pharmacopoeia and transferred in Nessler cylinderTake 1ml of 0.05845 % W/V solution of sodium chloride in Nessler cylinderAdd 1ml of nitric acidAdd 1ml of nitric acidDilute to 50ml in Nessler cylinderDilute to 50ml in Nessler cylinderAdd 1ml of AgNO3 solutionAdd 1ml of AgNO3 solutionKeep aside for 5 minKeep aside for 5 minObserve the Opalescence/TurbidityObserve the Opalescence/Turbidity

Observation:

Reasons:

Nitric acid is added in the limit test of chloride to make solution acidic and helps silver chloride precipitate to make solution turbid at the end of process.