Cd amalgam is prepared by electrolysis of a solution of `CdCl_(2)` using a mercury cathode. Find how long (in min) should a current of 5 ampere is passed in order to prepared 12% Cd-Hg amalagam on a cathode of `2.56 g` mercury ? At.wt. of Cd =112.40.

Answer

2

Explanation

`88g Hg` has `12g Cd`
`:. 2.56g Hg` require `=(12 xx 2)/(88)g Cd = 0349`
`: Cd^(2+) +2e rarr Cd [ :. E_(cd) = (112.40)/(2)]`
Now, `[ :. E_(cd) = (112.40)/(2)]`
`0.349 = (112.4xx 5 xx t)/(2 xx 96500) = 120 sec =2` minuts