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Why do crystals of sodium carbonate lose some mass on heating?

Answer and explanation

Correct answer: Water of crystallisation is lost

Crystals of sodium carbonate commonly contain water of crystallisation; washing soda is represented as Na₂CO₃·10H₂O. On heating, some or all of this water is driven out of the crystal lattice as water vapour, so the measured mass decreases. Sodium atoms do not disappear, carbon does not turn into gold, and the crystal does not consume air. Therefore, option A correctly explains the mass loss.

Related tags

Sodium CarbonateWater Of CrystallisationHeatingAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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