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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. Next, the object is moved to a second vat in which 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: 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 is the greatest mass of metal deposited on a car bumper? Justify your answer.

1) Calculate the Ne of Ni

2) Calculate the Ne of Cr 

3) Mass of Ni in g correct number of sig digs

4) Mass of Cr in g correct number of sig digs

5) Which vat produces the greater mass of metal.


To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. In order to plate 200 g of chromium, calculate the length of time for which a standard bumper should be immersed in a chromium vat.

ne (mol of Cr) (mass in g and correct sig digs) 

time to plate the 200 g of chromium in seconds

Top Answer

A) 1) moles of Ni formed=9.328moles 2) moles of Cr formed=3.109moles 3) mass of Ni formed=547.46g 4) mass of Cr... View the full answer

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