How to Prepared and Standardize of 0.1 N Potassium Permanganate Volumetric solution.

How to Prepared and Standardize of 0.1 N Potassium Permanganate Volumetric solution.

                                                           

                                                       

                                                        

Preparation of 0.1 Potassium Permanganate Volumetric solution

➤ Glass ware and instruments required.

Beaker, Glass stirrer, Graduated Pipettes, Graduated cylinder, Analytical balance, Sucker, Volumetric flask, Burette, Conical Flask, Fume hood.

➤ Reagents required.

Potassium Permanganate reagent grade,

Molecular Wt. :- KMnO₄, 158.03

Potassium Iodide,

Sulphuric Acid 1 Molar,

Sodium Thiosulphate volumetric solution,

Starch Solution,

➤ Preparation.

Transfer about 3.3 g of potassium permanganate reagent grade in 1000 ml beaker add dissolve in 1000 ml of water and boil the solution for about 15 minutes. Transfer to 1000 ml volumetric flask, stoppered the flask, allow to stand for at least 2 days, and filter through sintered glass crucible or using glass wool.

➤ Standardization.

Pipette out 25 ml of 0.1 N potassium permanganate into 250 ml glass stoppered flask, add 2 g of potassium iodide and 10 ml of 1 M sulphuric acid and titrate with 0.1 N / 0.02 M sodium thiosulphate VS using 1 ml of starch solution, added towards the end of the titration, as indicator. The end point is from blue to colourless. Note this final end point as burette reading V1 ml. Similarly carry out blank determination by using same quantities of reagent but taking 25 ml of water instead of potassium permanganate solution.

➤ Calculations. 

                          ml   Na₂S₂O₃  x  N  Na₂S₂O₃

N / M = ----------------------------------------------------------------------

                ml  KMnO₄ solution  [ Burette reading in ml ]