1.

Solid Ba(NO_(3))_(2) is gradually dissolved in a 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)=5.1xx10^(-9))

Answer»

`4.1xx10^(-5)M`
`8.1xx10^(-8)M`
`5.1xx10^(-5)M`
`8.1xx10^(-7)M`

Solution :`K_(SP)=[BA^(2+)][CO_(3)^(2-)]`
`5.1xx10^(-9)=[Ba^(2+)]xx10^(-4)`
`[Ba^(2+)]=5.1xx10^(-5)M`.


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