Consider the sulphates of the alkaline earth metals: , , , , . How many of these compounds are class — s Block Elements Chemistry Question

💡 Solution & Explanation

The solubility of alkaline earth metal sulphates decreases rapidly down the group. Because of the extremely high hydration enthalpies of the small $Be^{2+}$ and $Mg^{2+}$ ions, only $BeSO_4$ and $MgSO_4$ are considered readily soluble in water. $CaSO_4$ is sparingly soluble, and $SrSO_4$ and $BaSO_4$ are virtually insoluble.