1.

Duringthe quation analysis of a mixturecontainingCu^(2+) and Zn^(2+) ions H_(2)S gas ispassed theroughan acidifiedsolutioncontainingthese ions in order to test Cu^(2+) aloneexplane

Answer»

SOLUTION :`H_(2)S hArr 2H^(o+) +S^(2-)`
`HCI rarr H +CI^(Theta)`
`K_(sp) `(SOLUBILITY product) of `CuS` is lessthan `K_(sp)` of `ZnS `.Due tocommonion EFFECT ,the ionisation of `H_(2)S` is sappressed and the `S^(2-)` concentration decreases
Onlythose metalsulphides getprecipitate whichhave low `K_(sp)` so ZnS is notprecipitate.


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