question archive Electroplating is a widely used process
Electroplating is a widely used process
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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. Half-reactions occurring in each vat are shown below:
Plating of Nickel Ni2+(aq) + 2 e- → Ni(s)
Plating of Chromium Cr2+(aq) + 2e- → Cr(s)
To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. Determine how much time (in seconds) a standard bumper should be immersed in a chromium vat.
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Step-by-step explanation
We need to use Faraday's Law:
mass= 200 g
W= molar mass of chromium = 52 g/mol
I= current = Not given, so assume 1 Ampere
n= number of electrons = 2 (according to the reactions)
F= Faraday's constant = 96 500 C
m= WIt/ nF
200 g = [(52 g / mol Cr) (1 A) t] / 2 (96500 C)
t=742 307.69 seconds
