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Question

In the standardisation of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent mass ofK2Cr2O7 is x. What is the value of x if M is the molecular mass of K2Cr2O7?

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Solution

K2Cr2O7+6KI+7H2SO44K2SO4+Cr2(SO4)3+7H2O+3I2

Change in oxidation state of Cr per molecule = 12- 6 = 6

Thus, Eq mass of K2Cr2O7=M/6

i.e. x = 6

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