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Why is sodium carbonate used to soften hard water?

Answer and explanation

Correct answer: It helps remove calcium and magnesium ions

Hard water contains dissolved calcium and magnesium ions, which react with soap and form scum. Sodium carbonate supplies carbonate ions that can precipitate these ions as insoluble carbonates, such as calcium carbonate. Removing or reducing these ions decreases hardness, so option A is correct. Sodium carbonate does not convert water into an acid, generate chlorine, or vaporise it; those statements do not describe water softening.

Related tags

Washing SodaHard WaterWater SofteningAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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