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In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight ofK2Cr207 is(1) Molecular weight/2 (2) Molecular weight/6(3) Molecular weight/3 (4) same as molecular weight
Asked by Nancy Sharma(student) , on 17/5/12


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EXPERT ANSWER

Hi,

The iodometry titration of K2Cr2O7, Chromium is being reduced by Na2S2O3 from Cr6+ in K2Cr2O7, to Cr3+, according to the following reaction :

Cr2O7 2- + 6 e- → 2 Cr3+

Now, since in this redox titration reduction of Chromium involves a 6 electron change, therefore the equivalent weight of K2Cr2O7 = Molecular weight / 6.

Thus, the correct option is (2).

Hope, this information is helpful.

Enjoy learning!!

Posted by Kanika Dalal(MeritNation Expert)on 18/5/12

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