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Preparation and Standardization of 0.02 M Potassium Permanganate

Preparation and standardisation of 0.02 M Potassium Permanganate using Sodium Thiosulphate and Starch solution as indicator.

Potassium Permanganate Solution Preparation

  • Dissolve 3.2 g of potassium permanganate in 1000 ml of water.
  • Heat on a water-bath for 1 hour.
  • Allow to stand for 2 days and filter through glass wool.
  • Standardize the solution in the following manner.

Potassium Permanganate Solution Standardization

  • To 25.0 ml of the solution in a glass-stoppered flask add 2 g of potassium iodide, followed by 10 ml of 1 M sulphuric acid. 
  • Titrate the liberated iodine with 0.1 M sodium thiosulphate, using 3 ml of starch solution, added towards the end of the titration, as an indicator. 
  • Perform a blank determination and make the necessary correction.
  • Store protected from light.
  • 1 ml of 0.1 M sodium thiosulphate is equivalent to 0.003161 g of KMnO4.
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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