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Iodometric Titrations

On the other hand, it is possible to estimate active oxidizing agents like permanganates, dichromate, hydrogen peroxide and cupric ions by treating with excess of potassium iodide to liberate iodine. The liberated iodine is then estimated by titration against standard sodium thiosulphate solution. The following reactions are involved in these titrations:

With acidified KMnO4 solution
                                2KMnO4 + 3H2SO4    →    K2SO4 + 2MnSO4 + 3H2O + 5(O)
                                     2KI + O + H2SO   →    K2SO4 + H2O + I2

With acidified K2Cr2O7 solution
                                K2Cr2O7 + 4H2SO4    →    K2SO4 + Cr2(SO4)3 + 4H2O + 3(O)
                                      2KI + O + H2SO4   →   K2SO4 + H2O + I2

Withe copper sulphate solution
                                        CuSO4 + 2KI     →   CuI2 + K2SO4
                                                       2CuI2   →   Cu2I2 + I2 .

All those titrations in which an oxidizing agent is estimated by first reacting with potassium iodine and estimating the liberated iodine with standard sodium thiosulphate solution are known as Iodomertric titrations.

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