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Why may washing soda crystals gradually appear like a white powder when left exposed to air?

Answer and explanation

Correct answer: Because they can lose water of crystallisation

Washing soda is sodium carbonate decahydrate, Na₂CO₃·10H₂O, so its crystals contain water of crystallisation. When exposed to dry air, some of this water may be lost through efflorescence. The hydrated crystals then lose their clear crystalline appearance and may become opaque, crumbly, or powder-like. Therefore, option A is correct; no hydrogen gas, copper sulphate, or acid is formed.

Related tags

Washing SodaEfflorescenceWater Of CrystallisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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