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Why are BeSO_(4) and MgSO_(4)readily soluble in water while CaSO_(4), SrSO_(4) and BaSO_(4) are insoluble? |
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Answer» Solution : Solubility of sulphates of group 2 ELEMENTS depends on their hydration ENERGY which decreases down the group. The lattice energy of group 2 sulphates is almost same. Very high hydration enthalpy`Be^(+2)and Mg^(+2)`ions overcome the lattice enthalpy and their sulphates are soluble. However, the hydration enthalpy of`CA^(2+), Sr^(2+)and BA^(2+)`cannot overcome their lattice enthalpy and remain insoluble in water. |
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