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In volumetric analysis, how many moles of Mohr's salt are needed per mole of dichromate ions?

1. 3
2. 4
3. 6
4. 7

Correct answer: 6

Solution

Cr2O7²- + 14H+ + 6Fe2+ -> 2Cr3+ + 7H2O + 6Fe3+, so 6 mol of Fe2+ (Mohr's salt) react per mole of dichromate.

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