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April 25, 2015

Homework Help: Chemistry

Posted by Val on Monday, March 29, 2010 at 10:47pm.

How much time is required to electroplate 6.530 g of chromium from a potassium dichromate solution, by using a current of 118 mA?

I thought the ratio of e- to moles chromium would be 6/2 but I guess that is wrong? I am using t= nF/A
I already made the proper conversions to grams and A's....just confused on the potassium dichromate to chromium. I have it ias KCr2O7 + 6e-==> 2CrO4^2- which is where i got hte ratio to be 6/2

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