A current of 3.03 A is passed through a Cr(NO3)2 solution. How long (in hours) would this current...

Question

A current of 3.03 A is passed through a Cr(NO3)2 solution. How long (in hours) would this current have to be applied to plate out 7.50 g of chromium?

David · Accepted Answer

This is an example for chrome plating. The reaction involved is reduction of chromium ions to 
chromium metal as shown below: 
Cr
+2 
(aq) + 2e
-
  ------------> Cr (s) .oCr(NO3)2  
Using the equation  
Q = n(e) * F  
where  
Q = the amount of electricity or charge in coulombs C,

A current of 3.03 A is passed through a Cr(NO3)2 solution. How long (in hours) would this current have to be applied to plate out 7.50 g of chromium?

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