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3. Explain why the molar volume of MgSOA is negatif for very dilute solution of MgSO4 in waterl 4. A graph of mixtures of phe
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3. The molar volume (volume /mole) of MgSO4 is negative in very dilute water because the hydrogen bonding of pure water is break and the expansion of water volume due to hydrogen bonding is create more volume of water in pure state, this hydrogen bonding is break by Mg2+ and SO4 2- ion . It is break by solvation(water sphere) of Mg2+ and SO4 2- ion. Hence molar volume of water decrease as expansion decrease by removing of hydrogen bonding. Or in other way we say that open structure of water break by Mg2+ and SO4 2-ion by itself making as hydration sphere.

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