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An aqueous solution contains an unknown ...

An aqueous solution contains an unknown concentration of `Ba^(2+)`. When 50 mL of a 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 `1xx10^(–10)`. What is the original concentration of `Ba^(2+)`?

A

`1.0xx10^(-10)M`

B

`5xx10^(-9)M`

C

`2xx10^(-9)M`

D

`1.1xx10^(-9)M`

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The correct Answer is:
D
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