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Grade: 10
         In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr2O7 is 

a. (molecular weight)/2
b. (molecular weight)/6
c. (molecular weight)/3
d. same as molecular weight
5 years ago

Answers : (1)

Navjyot Kalra
askIITians Faculty
654 Points
							Sol. the following reaction occur between S_2 O_3^(2-) and 〖Cr〗_2 O_7^(2-) :
26H+ + 〖3S〗_2 O_3^(2-) + 〖4Cr〗_2 O_7^(2-) → 6SO_3^(2-) + 8Cr3+ + 13H2O
Change in oxidation number of 〖Cr〗_2 O_4^(2-) per formula unit is 6 (it is always fixed for 〖Cr〗_2 O_7^(2-)).
Hence, equivalent weight of K2Cr2O7 = (Molecular weight)/6
the following reaction occur between S_2 O_3^(2-) and 〖Cr〗_2 O_7^(2-) :
26H+ + 〖3S〗_2 O_3^(2-) + 〖4Cr〗_2 O_7^(2-) → 6SO_3^(2-) + 8Cr3+ + 13H2O
Change in oxidation number of 〖Cr〗_2 O_4^(2-) per formula unit is 6 (it is always fixed for 〖Cr〗_2 O_7^(2-)).
Hence, equivalent weight of K2Cr2O7 = (Molecular weight)/6

						
5 years ago
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