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How does washing soda help soften hard water?

Answer and explanation

Correct answer: By removing calcium and magnesium ions

Hard water contains dissolved calcium and magnesium ions, which react with soap to form scum and reduce lather. Washing soda supplies carbonate ions that precipitate these ions as insoluble carbonates, such as calcium carbonate. Removing the ions reduces hardness, so option A is correct. It does not soften water by forming hydrogen or chlorine gas, and making water acidic would not be the governing process.

Related tags

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

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