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Precipitation takes place when the ionic product of a salt is greater than the solubility product. We are given that the solubility product of CaF2 is 1.7 X 10-10. So, the ionic product of CaF2 should be greater than this value. The ionic product of CaF2 can be calculated as follows :
= [Ca2+] X [F-]2
on using the values given in (a), the ionic product of CaF2 comes out to be 1 X 10-12, while using the values given in (c), we get 1 X 10-11 as the answer. However, on using the values given in (b), the ionic product comes out to be
= [10-2] X [10-3]2
= 10-2 X 10-6
= 10-8
Thus, in this case, the ionic product of CaF2 is greater than solubility product. Hence the correct answer is (b) 10-2 M Ca2+ and 10-3 M F-
Regards
Arun (askIITians forum expert)
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