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If washing soda is added to hard water, what is the main benefit of insoluble substance formation?

Answer and explanation

Correct answer: Calcium and magnesium ions are removed

The governing concept is the removal of hardness by precipitation. Hard water contains dissolved calcium and magnesium ions. Washing soda, sodium carbonate, supplies carbonate ions that react with these ions and form insoluble calcium carbonate and magnesium carbonate. The precipitates can then be separated, reducing hardness. Thus option A is correct. Sodium ions are not destroyed, and the process neither makes water acidic nor produces chlorine.

Related tags

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

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