Grade 12th passPhysical Chemistry
In the standardization of Na2S2O3 using K2Cr2O7 by iodometry , the equivalent weight of Na2S2O3 is__?
1 Answer
Arun
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/6
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/6
Hence equivalent weight of Na2S2O3 = 294.18/6
= 49.03 gm
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