Why are beso4 and mgso4 readily soluble in water while caso4, srso4 and baso4 are insoluble?.Com?
Answers
The hydration enthalpies of BeSO4 and MgSO4 are quite high because of small size of Be2+ and Mg2+ ions. These hydration enthalpy values are higher than their corresponding lattice enthalpies and therefore, BeSO4 and MgSO4 are highly soluble in water. However, hydration enthalpies of CaSO4, SrSO4 and BaSO4 are not very high as compared to their respective lattice enthalpies and hence these are insoluble in water.
BeSO4 and MgSO4 are readily soluble in water due to their high hydration enthalpies while CaSO4, SrSO4 and BaSO4 are insoluble because of their low hydration enthalpies.
- The hydration enthalpies of BeSO4 and MgSO4 are very high because of small size of Be2+ and Mg2+ ions and they overcome the lattice enthalpy making their sulphates soluble in water.
- Whereas the hydration enthalpies of CaSO4, SrSO4 and BaSO4 are not very high enough to overcome their lattice enthalpies and hence these are insoluble in water.