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I have mostly come across examples of solids whose solubility increases in liquids with an increase in temperature. However, there seem to be exceptions to generalized rule this such as the solubility of $\ce{Ce2(SO4)3}$ in water. What makes this substance so special?

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marked as duplicate by Mithoron, Mathew Mahindaratne, Karl, Todd Minehardt, Tyberius Aug 12 at 17:09

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