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Consider a titration of potassium dichromate solution with acidified Mohr’s salt solution using diphenylamine as indicator. The number of moles of Mohr’s salt required per mole of dichromate is a. 3 b. 4 c. 5 d. 6

Consider a titration of potassium dichromate solution with acidified Mohr’s salt solution using diphenylamine as indicator. The number of moles of Mohr’s salt required per mole of dichromate is
a. 3
b. 4
c. 5
d. 6

Grade:upto college level

1 Answers

Deepak Patra
askIITians Faculty 471 Points
9 years ago
Sol. As mentioned in Q. 12, n-factor of dichromate is 6. Also, n-factor of Mohr’s salt is 1 as : FeSO4(NH4)2 SO4. 6H2O □(→┴(O.A) ) Fe3+ Moh’s salt ∵ 1 mole of dichromate = 6 equivalent of dichromate. ∴ 6 equivalent of Mohr’s salt would be required. Since, n-factor of Mohr’s salt is 1, 6 equivalent of it would also be equal to 6 moles. Hence, 1 mole of dichromate will oxidise 6 moles of Mohr’s slat.

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