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.
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