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Why is washing soda used to soften hard water?

Answer and explanation

Correct answer: It helps remove calcium and magnesium ions

The governing concept is removal of hardness-producing ions by precipitation. Hard water contains dissolved calcium and magnesium ions, which react with soap to form scum and prevent lather. Washing soda, sodium carbonate, supplies carbonate ions that can form sparingly soluble calcium carbonate and magnesium carbonate, removing these ions from the water. Therefore option A is correct. It does not convert water into gas, generate oxygen, or soften water by making it acidic.

Related tags

Washing SodaHard WaterSofteningCalcium MagnesiumAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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