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An aqueous solution contains an unknown ...

An aqueous solution contains an unknown concentration of `Ba^(2+)` . When 50 mL of 1 M solution of `Na_(2)SO_(4)` is added , `BaSO_(4)` just begins to precipitate . The final volume is 500 mL . The solubility product of `BaSO_(4)` is `1 xx 10^(-10)` . what is the original concentration of `Ba^(2+)` ?

A

`1.1 xx 10^(-9) M`

B

`1.0 xx 10^(-10) M `

C

`5 xx 10^(-9) M`

D

`2 xx 10^(-9)` M

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