CAIE A-Level Chemistry A2 27.1.2 Trends the Variation in Solubility Questions

M1 solubility decreases down the group

M2 $\Delta H_{\text {latt }}$ and $\Delta H_{\text {hyd }}$ both become less exothermic / more endothermic

M3 $\Delta H_{\text {latt }}$ changes less (than $\Delta H_{\text {hyd }}$ as $\mathrm{SO}_{4}{ }^{2-}$ being larger than $\mathrm{M}^{2+}$ )

M4 $\Delta H_{\text {sol }}$ becomes less exothermic / less negative