1.

Solid Ba(NO_(3))_(2) is gradually dissolved in a 1.0 xx 10^(-4) M Na_(2)CO_(3) solution. At what concentration of Ba^(2+) will a precipitate begin to form (K_(sp) for BaCO_(3) = 5.1 xx 10^(-9))

Answer»

`4.1 xx 10^(-5) M`
`5.1 xx 10^(-5) M`
`8.1 xx 10^(-8) M`
`8.1 xx 10^(-7) M`

SOLUTION :`{:(Na_(2)CO_(3),rarr,2Na^(+),+,CO_(3)^(-2)),(1xx 10^(-4)M,,2 xx 10^(-4)M,,1 xx 10^(-4)M):}`
`K_(sp)[BaCO_(3)] = [BA^(+2)][CO_(3)^(-2)]`
`5.1 xx10^(-9) = [Ba^(+2)] xx 1 xx 10^(-4)`
`[Ba^(+2)] = 5.1 xx 10^(-5) M`.


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