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Preparation and Standardization of 0.1 M Ammonium Thiocyanate

Preparation and standardisation of 0.1 M Ammonium Thiocyanate solution using silver nitrate and Ferric Ammonium Sulphate solution as indicator used in chemical analysis of pharmaceutical ingredients.

Ammonium Thiocyanate Solution Preparation

•  Dissolve 7.612 g of ammonium thiocyanate in sufficient water to produce 1000 ml.
•  Standardize the solution in the following manner.

Ammonium Thiocyanate Solution Standardization

•  Pipette out 30.0 ml of 0.1 M silver nitrate into a glass-stoppered flask and dilute with 50 ml of water.
•  Add 2 ml of nitric acid and 2 ml of ferric ammonium sulphate solution.
•  Titrate with the ammonium thiocyanate solution to the first appearance of a red-brown color.


         Volume of AgNO3 x Normality of AgNO3
M= ----------------------------------------------------
                   Volume of NH4SCN

Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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