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In crystallography, 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 File:Copper sulfate.jpg|Hydrated copper(II) sulfate is bright blue. File:Copper sulfate anhydrous.jpg|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. == Nomenclature == In molecular formulas ''water of crystallization'' can be denoted in different ways: *"''hydrated compound''⋅''n''H2O" or "''hydrated compound''×''n''H2O" :This notation is used when the compound only contains ''lattice water'' or when the crystal structure is undetermined. For example Calcium chloride: CaCl2·2H2O *"''hydrated compound''(H2O)''n''" :A hydrate with coordinated water. For example Zinc chloride: ZnCl2(H2O)4 *Both notations can be combined as for example in copper(II) sulfate: ()SO4·H2O 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Water of crystallization」の詳細全文を読む スポンサード リンク
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