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Preparation and Standardization of 0.1 M Ferric Ammonium Sulphate

Preparation and standardisation of 0.1 M Ferric Ammonium Sulphate solution using Sodium Thiosulphate and starch solution as indicator used in chemical analysis of pharmaceutical substances.

Ferric Ammonium Sulphate Solution Preparation

•  Dissolve 50 g of ferric ammonium sulphate in a mixture of 300 ml of water and 6 ml of sulphuric acid.
•  Dilute with sufficient freshly boiled and cooled water to produce 1000 ml.
•  Standardise the solution in the following manner.

Ferric Ammonium Sulphate Solution Standardization

•  To 25.0 ml add 3 ml of hydrochloric acid and 2 g of potassium iodide.
•  Allow to stand for 10 minutes.
•  Titrate the liberated iodine with 0.1 M sodium thiosulphate using starch solution, added towards the end of the titration, as indicator.
•  1 ml of 0.1 M sodium thiosulphate is equivalent to 0.04822 g of FeNH4(SO4)2.12H2O.

Also see: Determination of Shelf Life of Solutions in Laboratory

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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