1.

The solubility product of a salt having a general formula MX_2 in water is 4 times 10^-2. The concentration of M^(2+) ions in the aqueous solution of the salt is………

Answer»

`2.0 times 10^-6 M`
`1.0 times 10^-4M`
`1.6 times 10^-4 M`
`4.0 times 10^-10 M`

Solution :`MX_2 LEFTRIGHTARROW M^(2+)+2X^-`
`K_(sp)=(2S)^2 (s)=4s^2`
`s=sqrt(K_(sp)/4)=sqrt((4 times 10^-12)/4)`
`=1.0 times 10^-4 M`


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