[maha.t.malik]

there're a couple of questions I'm completely lost on, and there're no lecture notes online. Any help would be greatly appreciated!


Electroplating is a widely used process. One of the most popular electroplating processes involves the plating of two metals, nickel and chromium, in separate vats. Nickel is plated first because it adheres better to iron, then the object is moved to a second vat where a layer of chromium is plated. The half-reactions occurring in each vat are shown below:



we're given these equations:
Plating of Nickel Ni2+(aq) + 2 e-  Ni(s)

Plating of Chromium   Cr2O72-(aq) + 14 H+(aq) + 12 e-  2 Cr(s) + 7 H2O(l)

--The power supply used in commercial electroplating provides each vat with approximately 1.50 x 103 A of current for 20.0 minutes. In which vat (Ni or Cr) is the greatest mass of metal deposited on a car bumper? Justify your answer. (4 marks)
I know faraday's law is Q = IT, where Q is the quantity of electricity, I is the current, and T is the time. In this case Q =  But where does mass (g) fit in? And how would I use the equations?

----To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. Determine how much time a standard bumper should be immersed in a chromium vat. (4 marks)
again im wondering where the mass fits in to Q=IT

----Describe a strategy that can be used in electroplating to maintain the concentration of aqueous ion in the vat where nickel is plated. (2 marks) completely unsure )=
Thank you for any help you could provide!

[Hunter2]

No you missed something. Q = I *t  is only the charge.

Faraday law is m = M*I*t((z*F) =  M*Q(z*F) = Q*c 

M molare mass ,I = current, t = time; z amount of electron which go over, F = Faraday constant 96487 As
c = elctrochemical eqivalent can be found in table books.

[Hunter2]

Some mistyping

No you missed something. Q = I *t  is only the charge.

Faraday law is m = M*I*t/(z*F) =  M*Q/(z*F) = Q*c

M molar mass ,I = current, t = time; z amount of electron which go over, F = Faraday constant 96487 As
c = electrochemical equivalent can be found in table books.