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Question

Cadmium amalgam is prepared by electrolysis of a solution of CdCl2 using a mercury cathode. Find how long a current of 5 ampere should be passed in order to prepare 12% CdHg amalgam on a cathode of 2 g mercury. At. mass of Cd=112.40.

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Solution

2 g Hg require Cd to prepare 12% amalgam of
=1288×2=0.273 g
Cd2+1 mole112.40 g+2e2×96500 CCd
Charge required to deposit 0.273 g of Cd
=2×96500112.40×0.273 coulomb
Charge=ampere×second
Second=2×96500×0.273112.40×5=93.75.

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