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How does washing soda soften hard water?

Answer and explanation

Correct answer: By removing calcium and magnesium ions

Hard water contains dissolved calcium and magnesium ions, which can form deposits and react with soap. Washing soda supplies carbonate ions that precipitate these ions as insoluble carbonates, such as calcium carbonate and magnesium carbonate. Removing them reduces hardness, so option A is correct. The process does not depend on hydrogen or chlorine gas and does not make the water acidic.

Related tags

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

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