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So the hydrated compound I am thinking about specifically is pentahydrate copper sulphate. I know when you put ionic compounds in water, the ions because hydrated by the water molecules. However, what happens when you are already putting a hydrated ion into the water? I think the solubility is supposed to be lower, but I am not exactly sure why. Thanks for any help :)

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    $\begingroup$ If you dissolve 1 mole of pentahydrate copper sulphate you add 5 mols of water that's the only reason for different solubility - ends up with more solvent then begins. $\endgroup$ – Mithoron Aug 9 at 0:25

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