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Washing soda softens hard water by removing which ions?

Answer and explanation

Correct answer: Calcium and magnesium ions

The hardness of water is mainly caused by dissolved calcium and magnesium ions, often present as bicarbonates, chlorides, or sulphates. Washing soda, Na₂CO₃·10H₂O, supplies carbonate ions that precipitate these ions as insoluble calcium carbonate and magnesium carbonate. Removing them softens the water, so option A is correct. Sodium and chloride ions generally do not cause ordinary hardness.

Related tags

Washing SodaHard WaterCalcium MagnesiumAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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