The values of Ksp of `CaCO_(3)` and `CaC_(2)O_(4)` are `4.7 xx 10^(-9)` and `1.3 xx 10^(-9)` respectively at `25^(@)C`. If the mixture of these two is washed with water, what is the concentration of `Ca^(2+)` ions in waterA. `5.831 xx 10^(-5)M`B. `6.856 xx 10^(-5)M`C. `3.606 xx 10^(-5) M`D. `7.746 xx 10^(-5) M`

The values of Ksp of `CaCO_(3)` and `CaC_(2)O_(4)` are `4.7 xx 10^(-9)

1.	The values of Ksp of `CaCO_(3)` and `CaC_(2)O_(4)` are `4.7 xx 10^(-9)` and `1.3 xx 10^(-9)` respectively at `25^(@)C`. If the mixture of these two is washed with water, what is the concentration of `Ca^(2+)` ions in waterA. `5.831 xx 10^(-5)M`B. `6.856 xx 10^(-5)M`C. `3.606 xx 10^(-5) M`D. `7.746 xx 10^(-5) M`
Answer» Correct Answer - D `CaCO_(3) rarr underset(x)(Ca^(2+)) + underset(x)(CO_(3))^(2-)` `CaC_(2)O_(4) rarr underset(y)(Ca^(2+)) + underset(y)(C_(2)O_(4))^(2-)` Now, `[Ca^(2+)] = x + y` and `x(x+y) = 4.7 xx 10^(-9)` `y(x+y) = 1.3 xx 10^(-9)` On solving we get `[Ca^(2+)] = 7.746 xx 10^(-5)M`.

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