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Which salt is used for washing clothes and for removing the permanent hardness of hard water?

Answer and explanation

Correct answer: Na₂CO₃·10H₂O / Sodium carbonate decahydrate

Na₂CO₃·10H₂O is washing soda, or sodium carbonate decahydrate. Its carbonate ions react with dissolved Ca²⁺ and Mg²⁺ ions responsible for permanent hardness, producing insoluble carbonates that can be removed. NaHCO₃ is baking soda, CaOCl₂ is bleaching powder, and CaSO₄·½H₂O is plaster of Paris. Therefore, the salt used for washing and softening hard water is option A.

Related tags

Washing SodaHard WaterPermanent HardnessSaltsSodium CarbonateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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