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Which substance contains water of crystallisation?

Answer and explanation

Correct answer: Washing soda

Water of crystallisation is the definite number of water molecules chemically associated with one formula unit of a hydrated salt. Washing soda is hydrated sodium carbonate, Na₂CO₃·10H₂O, so it contains ten water molecules of crystallisation. Baking soda is NaHCO₃ and does not contain such water in its formula; sodium chloride and calcium oxide are also represented here as anhydrous substances. Therefore option A is correct.

Related tags

Water-Of-CrystallisationHydrated-SaltsWashing-SodaSaltsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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