explain recrystallisation of copper sulphate
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As crystals grow in a solution of an impure chemical, the impurities remain in solution. Second, some chemicals are much more soluble in hot water than in cold. For example, the solubility of copper sulfate pentahydrate, the chemical we'll purify in this lab, is 203.3g/100mL at 100 °C, versus only 31.6g/100mL at 0 °C
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