1.

What is the minimum concentration of SO_(4)^(2-) required to precipitate BaSO_(4) in a solution containing 1.0 xx 10^(-4) mol Ba^(2+) (K_(sp) for BaSO_(4) is 4 xx 10^(-10))

Answer»

`4 xx 10^(-10)M`
`2 xx 10^(-7)M`
`4 xx 10^(-6)M`
`2 xx 10^(-3) M`

SOLUTION :`BaSO_(4) hArr BA^(2+) + SO_(4)^(2-)`
`K_(sp) = S^(2)rArr S = SQRT(K_(sp)) , K_(sp) = [Ba^(2+)] xx [SO_(4)^(2-)]`
`4 xx 10^(-10) = [1 xx 10^(-4)] xx [SO_(4)^(2-)]`
`[SO_(4)^(2-)] = (4 xx 10^(-10))/(1 xx 10^(4)) = 4 xx 10^(-6)`.


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