Question

Equal volumes of 0.02M CaCl2 0.0004M Na2SO4 are mixed. Will precipitate of CaSO4 form?

Answer 1

You need to quote a `"K"_"sp"` value for `"CaSO"_4`, and this should have been supplied with the question.

Explanation:

If `[Ca^(2+)][SO_4^(2-)]>"K"_"sp"`, then precipitation will occur until `[Ca^(2+)][SO_4^(2-)]="K"_"sp"`.