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Cadmium amalgam is prepared by electroly...

Cadmium amalgam is prepared by electrolysis of a sodium of `CdCl_2` using a mercury cathode. How long should a current of 4 A be passed in order to prepare 10% by mass Cd in Cd-Hg amalgam on cathode of 4.5 g Hg? (atomic mass of Cd=112)

Text Solution

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2g Hg require Cd to prepare 12% amalgam
`=12/88xx2=0.273 g`
`underset(("1 mole"),(112.40 g))(Cd^(2+))+underset(2xx96500 C)(2e^(-))rarr Cd`
Charge required to deposite 0.273 g of Cd
`=(2xx96500)/112.40xx0.273` coulomb
Charge = ampere `xx` second
Second `=(2xx96500xx0.273)/(112.40xx5)=93.75`
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