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Washing soda crystals contain a fixed amount of water. What is this water called?

Answer and explanation

Correct answer: Water of crystallisation

The governing concept is the fixed composition of hydrated salts. Washing soda is sodium carbonate decahydrate, Na₂CO₃·10H₂O, so ten water molecules are incorporated in the crystal structure in a definite ratio. This chemically associated water is called water of crystallisation, making option A correct. The other choices are not recognised chemical terms for water present in a salt crystal.

Related tags

Washing SodaWater Of CrystallisationHydrated SaltAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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