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Washing soda crystals become powdery when kept in open air. Which phenomenon does this illustrate?

Answer and explanation

Correct answer: Efflorescence

Washing soda is sodium carbonate decahydrate, Na₂CO₃·10H₂O, so its crystals contain water of crystallisation. On exposure to comparatively dry air, some of this water is lost from the crystal lattice. The crystals become dull and powdery; this process is called efflorescence. Deliquescence involves absorbing moisture and dissolving, while neutralisation and displacement are chemical reaction types. Therefore B is correct.

Related tags

Washing SodaEfflorescenceCrystallisation WaterAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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