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31 March, 07:01

A chemical reference book says that substance x is not soluble in water

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  1. 31 March, 07:22
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    The normal dividing line for soluble/not soluble is 0.1 M.

    If a substance, as a saturated solution at room temp and pressure, cannot form a solution concentration of 0.1 M, then it is considered insoluble.

    The 0.1 M figure was selected because _most_ substances are either well above that value or well below. Some substances (calcium hydroxide is one? not sure) come close to the 0.1 M dividing line but there are only a very few.

    but most likely it wont mix
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