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Which is the most correct meaning of water of crystallisation?

Answer and explanation

Correct answer: A fixed amount of water present in crystals of a salt

Water of crystallisation is the definite number of water molecules chemically associated with one formula unit of some hydrated salts. It is part of the crystal structure, not merely moisture or dissolved water. For example, CuSO4·5H2O contains five water molecules per formula unit, while washing soda is Na2CO3·10H2O. Thus option A gives the correct meaning; B, C and D describe unrelated substances or situations.

Related tags

Water Of CrystallisationHydrated SaltsCrystal StructureAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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