Question

Why do group 2 sulphates become less soluble down the group

Answer 1

Solubility decreases as you go down the group. The lattice dissociation enthalpy and hydration enthalpy both decrease as you go down the group. The hydration enthalpy decreases more than the lattice dissociation enthalpy. Therefore the enthalpy of solution becomes more endothermic (or less exothermic).

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