El agua de cristalización es el agua que se encuentra dentro de las redes de los cristales pero que no se halla unida de manera covalente a ninguna molécula o ion. Es un término arcaico que precede a la química inorgánica estructural moderna, y que proviene de una época en la que las relaciones entre fórmula mínima y estructura eran poco comprendidas. Sin embargo, el término ha permanecido en el tiempo, y cuando se emplea de manera precisa puede resultar muy útil. ¿por qué cristaliza el agua?

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In chemistry, water of crystallization or water of hydration or crystallization water is water that occurs inside crystals. Water is often necessary for the formation of crystals. In some contexts, water of crystallization is the total weight of water in a substance at a given temperature and is mostly present in a definite (stoichiometric) ratio. Classically, "water of crystallization" refers to water that is found in the crystalline framework of a metal complex or a salt, which is not directly bonded to the metal cation \n* Hydrated copper(II) sulfate is bright blue. \n* Anhydrous copper(II) sulfate is white. Upon crystallization from water or moist solvents, many compounds incorporate water molecules in their crystalline frameworks. Water of crystallization can generally be removed by heating a sample but the crystalline properties are often lost. Compared to inorganic salts, proteins crystallize with unusually large amounts of water in the crystal lattice. A water content of 50% is not uncommon.

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