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Which salt is used to remove the permanent hardness of hard water?

Answer and explanation

Correct answer: Sodium carbonate

Sodium carbonate, or washing soda
\(\mathrm{Na_2CO_3\cdot10H_2O}\), precipitates calcium and magnesium ions present in water as insoluble carbonates. Therefore, it is used to remove permanent hardness. Sodium hydrogen carbonate is not effective for this purpose.

Related tags

Acids Bases SaltsHard WaterPermanent HardnessWashing SodaSodium CarbonateClass 10 Science

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