Why can we use a water-ethanol mixture but not a water-hexane one as a recrystillizing solvent?

Answer

We can use a water-ethanol mixture but not a water-hexane one as a recrystallization solvent because water-hexane mixtures are immiscible in water. This means the water-hexane mixture cannot be mixed into water. The water-hexane solution would be unable to do its job.
Q&A Related to "Why can we use a water-ethanol mixture but not..."
Hexane is immiscible in water.
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water-ethonol are so easily mixed that there is no limit to the amount of ethanol that can be dissolved in water or the amount of water that can be dissolved in ethanol. When the
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