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What is meant by water of crystallisation?

Answer and explanation

Correct answer: Fixed amount of water present in salt crystals

Water of crystallisation is the fixed number of water molecules chemically associated with the formula unit of certain crystalline salts. It is not merely moisture on the surface or any water used to dissolve a substance. For example, washing soda contains ten water molecules, Na₂CO₃·10H₂O, and blue copper sulphate contains five, CuSO₄·5H₂O. Therefore option A gives the correct definition; the other choices describe unrelated forms of water.

Related tags

Water Of CrystallisationSaltsHydrated CrystalsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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