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CBSE Class 11-science Answered

Why Sr(OH)2 and Ba(OH)2 are soluble in water whereas Be(OH)2 and Mg(OH)2  are almost insoluble in water?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
Be(OH)2 and Mg(OH)2 are almost insoluble, Ca(OH)2 is sparingly soluble while Sr(OH)2 and Ba(OH)2 are fairly soluble. This is due to increase in size of the cation and decrease in their lattice energies on moving down the group. Hydration energies become more due to decrease in lattice energies and so the solubility of hydroxide in water increases. This explains the increasing solubility of alkaline Earth metal hydroxides on moving down the group. Lattice energy decreases with increase in size of the cation and therefore, solubility increases from Be to Ba.
Answered by | 04 Jun, 2014, 03:23: PM

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