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% Cd−Hg amalgam on a cathode of 2g mercury. At. mass of Cd=112.40.
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Solution
2gHg require Cd to prepare 12% amalgam of =1288×2=0.273g Cd2+1mole112.40g+2e−2×96500C→Cd Charge required to deposit 0.273g of Cd =2×96500112.40×0.273coulomb Charge=ampere×second Second=2×96500×0.273112.40×5=93.75.