1.

The precipitate of CaF_(2)(K_(sp) = 1.7 xx 10^(-10)) is obtained when equal volumes of the following are mixed

Answer»

`10^(-4) M Ca^(2+) + 10^(-4) M F^(-)`
`10^(-2) M Ca^(2+) + 10^(-3) M F^(-)`
`10^(-5) M Ca^(2+) + 10^(-3) M F^(-)`
`10^(-3) M Ca^(2+) + 10^(-5) M F^(-)`

Solution :CALCULATE the ionic product `[Ca^(2+)] [ F^(-)]^(2)` in each CASE and see that ionic product MUST exceed `K_(sp)` for precipitation. Concentration of each ion is halved due to dilution effect (Volume DOUBLED).


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