Why add specifically hot solvent during recrystallization procedures instead of heating it up after?
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The issue is that, without knowing beforehand the exact solubility of your compound, you do not know what is the "right amount" of solvent. Yeah, if you know the solubility perfectly, fair game, apart from decomposition/side reactions. However, if you're trying to recrystallise something new that you made in the lab (probably a much more common scenario), you don't want to start by guessing how much cold water/ethanol/whatever to add. – orthocresol
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