Method for Preparation and Standardization of 0.1 (N) Potassium Permanganate Solution

 Ø  Ø Apparatus:-

·         500 ml conical flask

·         1L Volumetric Flask

·         100 ml Cylinder

·         50 ml Burette

·         250 ml Beaker

Ø  Reagents:-

·         Potassium Permanganate (A.R Grade)

·         Sodium Oxalate (A.R. Grade)

·         Sulphuric Acid (A.R Grade)

Ø  Preparation of Solution:-

·         0.1 (N) Potassium Permanganate Solution:- 

Weight accurately 3.3 g Potassium Permanganate (A.R. Grade) in a 1000 ml volumetric flask and dissolve with DM Water and make up to 1L with DM Water. Then heat on a steam bath for two hours. Cover and allow to stand for 24 hours. Filter through a Whatman 42 Filter paper, discarding the first 25 ml.  Store in an amber-coloured air tight bottle and protect against dust. If manganese dioxide precipitates on standing, re-filter and re-standardize before use.

Ø  Standardization Procedure:-

Take accurately in 500 ml conical flask about 0.2 g of primary standard Sodium Oxalate, previously dried at 110°C for 2 hours. Add and dissolve in 250 ml DM Water. Add 10 ml Sulphuric Acid. Heat the solution up to 70˚C. And then titrate against prepared 0.1 (N) Potassium Permanganate Solution within temperature range 65˚C - 70˚C until the appearance of a pink colour which persist for 30 seconds. Do the same with a blank solution. Subtract the blank titration value from previous one to get actual volume consumed by the sample.

Ø Calculation:-