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Solubility chemistry question?

How and why does the solubility change from Mg(OH)2 to Ba(OH)2 because i would have thought it would have increased due to a reduction in electronegativity from Mg to Ba, but apparently it increases. could someone please explain?
anyone
Original post by Bertybassett
How and why does the solubility change from Mg(OH)2 to Ba(OH)2 because i would have thought it would have increased due to a reduction in electronegativity from Mg to Ba, but apparently it increases. could someone please explain?


It's a long answer, but down a group the enthalpy of hydration is greater than the lattice enthalpy of a compound, so it becomes thermodynamically more favourable to form an aqueous solution. This is the short answer and I think a2 chemistry explains it a bit better.

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