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CRYSTALLIZATION
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CRYSTALLIZATION , the See also:art of obtaining a substance in the See also:form of crystals; it is an important See also:process in See also:chemistry since it permits the See also:purification of a substance, or the separation of the constituents of a mixture. Generally a substance is more soluble in a solvent at a high temperature than at a See also:low, and consequently, if a boiling concentrated See also:solution be allowed to cool, the substance will See also:separate in virtue of the diminished solubility, and the slower the cooling the larger and more perfect will be the crystals formed. If, as sometimes appears, such a solution refuses to crystallize, the expedient of inoculating the solution with a See also:minute crystal of the same substance, or with a similar substance, may be adopted; shaking the solution, or the addition of a drop of another solvent, may also occasion the desired result. " Fractional crystallization " consists in repeatedly crystallizing a See also:salt so as to separate the substances of different solubilities. Examples are especially presented in the study of the rare-earths. Other conditions under which crystals are formed are given in the See also:article See also:CRYSTALLOGRAPHY. End of Article: CRYSTALLIZATIONAdditional information and CommentsThere are no comments yet for this article.
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