You do not have to worry because it will not affect the yield of the pure crystals.
Re-crystallization is the process of obtaining pure crystals from a super saturated solution.
This is done by heating a solution of the impure substance to a high temperature and then allowing the hot solution to cool down and the crystals begin to appear.
You do not have to worry about sudden vigorous boiling of crystal solution when you add the second solvent to the solution because it will not affect the yield of the pure crystals.
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