Amongst the following hydroxides, the one which has the lowest value of Ksp at ordinary temperature (about 25ºC) is :
In case of alkaline earth hydroxides solubility increases on moving down the group.Be(OH)2 has lowest solubility and hence lowest Ksp/sub>.
The solubility of CaF2 in pure water is 2.3×10-4 mol dm-3.Its solubility product will be :