1.

The value of K_(sp) of two sparingly soluble salts Ni(OH)_2 and AgCN are 2.0 times 10^-15 and 6 times 10^-17 respectively. Which salt is more soluble ? Explain.

Answer»

Solution :`AgCN leftrightarrow AG^(+)+ CN^-`
`K_(sp)=[Ag^(+)][CN^(-)]=6 times 10^-17`
`NI(OH)_2leftrightarrowNi^(2+)+2OH^-`
`K_(sp)=[Ni^(2+)][OH^-]^2=2 times10^-15`
Let `[Ag^+]=S_1,then[CN^-]=S_1`
Let `[Ni^(2+)]=S_2, then[OH^-]=2S_2`
`S_1^2=6times10^-17,S_1=7.8 times10^-9`
`(S_2)(2S_2)^2=6times10^-17,S_1=0.58 times10^-4`
`Ni(OH)_2` is more stable than AgCN.


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