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How does the ability that calcium hydroxide is more soluble in cold water than boiling water...

How does the ability that calcium hydroxide is more soluble in cold water than boiling water make it possible to perform an experiment in which we can determine the solubility product of calcium hydroxide by measuring the concentration of Ca(OH)2 in a saturated solution? -> why can't this be done with normal salts that typically increase in solubility with an increase in temperature?

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