Describe the experimental procedure and give the calculations involved in the estimation of potassium permanganate present in one dm^(3) of its solution using standard oxalic acid solution. Give the equation for the redox reaction.

Describe the experimental procedure and give the calculations involved

1.	Describe the experimental procedure and give the calculations involved in the estimation of potassium permanganate present in one dm^(3) of its solution using standard oxalic acid solution. Give the equation for the redox reaction.
Answer» Solution :Equation : `2KMnO_4 + 5H_2C_2O_4 + 3H_2SO4 to K_2SO_4 + 2MnSO_4 + 8H_2O + 10CO_2` `2KMnO_4 + 3H_2SO_4 to K_2SO_4 + 2MnSO_4 + 3H_2O + 5[O]` Procedure: `10 cm^3` of oxalic acid solution is pipetted into a clean CONICAL flask. Add one test tube full of dilute `H_2SO_4`. Warm the reaction mixture NEARLY to boiling (nearly `80^@C)` The hot solution is titrated against `KMnO_4` taken in the burette. End point is colour change from colourless to pale pink. Titrations to repeated to GET agreeing values. Results are tabulated. Calculation : `(N_1 V_1)KMnO_4 = (N_2V_2)H_2C_2O_4` `N_(KMnO_4) = (N_2 xx 10)/(V_(KMnO_4)) = N` Mass of `KMnO_4//dm^3 = N_(KMnO_4) xx "g. equivalent mass"` `= .............xx 31.6` `=..........g`