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What is one major use of washing soda?

Answer and explanation

Correct answer: Removing permanent hardness of water

Washing soda is sodium carbonate decahydrate, Na₂CO₃·10H₂O. Carbonate ions react with dissolved calcium and magnesium ions in hard water to form insoluble carbonates, removing them from solution. Thus washing soda softens water and can remove permanent hardness; option A is correct. The other choices describe neither its standard composition nor its principal household use.

Related tags

Washing-SodaHard-WaterWater-SofteningSodium-CarbonateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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