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Which substance is used to soften hard water?

Answer and explanation

Correct answer: Washing soda

Hard water contains dissolved calcium and magnesium ions, which interfere with soap and form scum. Washing soda, sodium carbonate (Na₂CO₃), reacts with these ions and precipitates them as insoluble carbonates, thereby removing their effect and softening the water. Baking powder, vinegar, and sugar do not provide this water-softening action in the stated context, so option A is correct.

Related tags

Washing SodaHard WaterSofteningAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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