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Describe the experimental procedure and ...

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.

Text Solution

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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`
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