Liquid, definition cold crystallization

Crystallization. — Most substances to be tested must first be purified. A convenient method of purification is crystallization. Most solid substances are more soluble in hot than in cold water. Hence a hot liquid on cooling will often deposit some of the dissolved solid, especially if the liquid contains much solid in solution. If the hot liquid is cooled slowly, the solid is deposited in masses having a more or less definite geometrical form, called crystals. This operation is called Crystallization, and the substance is said to Crystallize. If a solution evaporates slowly in the air, crystals will form when the solution reaches the... 

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