destroyer CG question 86

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bluesolic

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consider the rxn of 2.5 M dichromate
Cr2O7^-2 -> Cr^3+

what would be the solution Normality if the rxn goes to completion.

I thought the normality in acide condition, is the Mole of H+

which is like H2SO4 -> 2H+ which is going to be 1M -> 2N


however, the question here is little strange to me.

I thought it starts with 2Cr 2.5M and becomes 2 Cr^3+

doesn't it have to be 5N ??


the answer was 7.5N

I don't know why the electrons affects the Normality ... which the answer talked about ...

somebody explains please
 
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