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Washing soda softens hard water by removing which ions?

Answer and explanation

Correct answer: Calcium and magnesium ions

Hardness of water is mainly caused by dissolved calcium and magnesium ions. Washing soda, sodium carbonate decahydrate, supplies carbonate ions that react with them to form insoluble calcium carbonate and magnesium carbonate. These precipitates can be removed, reducing hardness. Sodium and chloride ions do not cause ordinary hardness, so option A is correct.

Related tags

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

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