In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr207 is (1) Molecular weight/2 (2) Molecular weight/6 (3) Molecular weight/3 (4) same as molecular weight
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The iodometry titration of K2Cr2O7,Chromium is being reduced by Na2S2O3 FROM Cr^6+ in K2CrO7,to Cr^3+,according to the following reaction;
Cr2O7^-2+6e^-→2Cr^3+
since in this redox titration reduction of chromium involves a 6 electron change,therefore the equivalent weight of K2Cr2O7=Molecular weight/16
thus the correct option=2
Cr2O7^-2+6e^-→2Cr^3+
since in this redox titration reduction of chromium involves a 6 electron change,therefore the equivalent weight of K2Cr2O7=Molecular weight/16
thus the correct option=2
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