Purification of chromium can be achieved by electrorefining chromium from an impure chromium anode onto a...

Purification of chromium can be achieved by electrorefining chromium from an impure chromium anode onto a pure chromium cathode in an electrolytic cell. Calculate the amount of hours it will take to plate 12.0 kg of chromium onto the cathode if the current passed through the cell is held constant at 38.5 A. Assume the chromium in the electrolytic solution is present as Cr^3+

______ h

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Expert Solution

Cr⁺³ + 3e^- ---------> Cr

Z = 3

M = 52g/mole

C = 38.5A

W = 12Kg = 12000g

W = MCt/ZF

12000 = 52*38.5*t/3*96500

t = 12000*96500*3/52*38.5

= 1735264.74sec

t = 1735264.74/3600 [ 1hr = 3600sec]

= 482hr

queen_honey_blossom answered 2 years ago

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