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How does washing soda help in softening hard water?

Answer and explanation

Correct answer: It removes calcium and magnesium ions as insoluble carbonates

Hard water contains dissolved calcium and magnesium ions, which react with soap to form scum and prevent good lather. Washing soda, sodium carbonate (Na₂CO₃), supplies carbonate ions. These combine with calcium and magnesium ions to form insoluble carbonates that can precipitate and be removed. Thus A is correct; washing soda does not acidify water, convert it into gas, or generate chlorine.

Related tags

Washing SodaHard WaterCarbonate PrecipitationWater SofteningAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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