An aqueous solution contains an unknown ...

An aqueous solution contains an unknown concentration of `Ba^(2+)` when 50 ML of a 1M solution of `Na_2SO_4` is added `BaSO_4` just begins to precipitate. The final volume is 500 ML . The solubility product of `BaSO_4` is `1xx10^(-10)`.what is original concentration of `Ba^(2+)` ?

A

`5 xx 10^(-9)` M

B

`2 xx 10^(-9)` M

C

`1.1 xx 10^(-9)` M

D

`1.0 xx 10^(-10)` M.

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The correct Answer is:

C

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