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Grade: 12th pass

                        

In the standardization of Na2S2O3 using K2Cr2O7 by iodometry , the equivalent weight of Na2S2O3 is__?

3 years ago

Answers : (1)

Arun
24742 Points
							
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
 
Hence equivalent weight of Na2S2O3 = 294.18/6
 
= 49.03 gm
3 years ago
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