The solubility product of a salt having general formula `MX_(2)` in water is `4xx10^(-12)`. The concentration of `M^(2+) ions` in the aqueous solution of the salt is:

Options

A. `2.0 xx 10^(-6) M`
B. `1.0 xx 10^(-4) M`
C. `1.6 xx 10^(-4) M`
D. `4.0 xx 10^(-10) M`

Answer

2

Explanation

`{:(MX_(2),hArr,M^(2+),+,2X^(-)),(,,s,,2s):}`
`K_("sp") = (2s)^(2)(s) = 4s^(3)`
`rArr S = 2root(3)(K_("sp")/4) = root(3)((4xx10^(-12))/4) = 1.0 xx 10^(-4) M`