Quote:
Originally Posted by SouthPark
In some online documents - there's mention of hot water causing calcium compound of some sort precipitation.
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Sometimes the above statement is correct, but not always. Search "calcium sulfate solubility temperature" on the web and one of the top results is a paper that includes solubility curves for various forms of calcium sulfate. Gypsum has its highest solubility roughly between 20 and 50 C, less soluble above that range. The anhydrite form of calcium sulfate is much less soluble at high temperature. There are more than a few compounds that behave this way.
Dissolution and the relationship with temperature depends on what you are trying to dissolve.
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