Question

Hard water gets softened on mixing with solution of washing soda???

Answer 1

Hard water can be softened by adding washing soda (sodium carbonate) which removes the calcium ions in a precipitation reaction. Alternatively, the hard water can be passed through an ion-exchange resin in a column. Sodium ions replace the calcium ions in the water as it passes through the column.

Answer 2

Answer:

Sodium carbonate, Na2CO3, is also known as washing soda. It can remove temporary and permanent hardness from water. Sodium carbonate is soluble but calcium carbonate and magnesium carbonate are insoluble.

The carbonate ions from sodium carbonate reacts with calcium and magnesium ions in the water to produce insoluble precipitate.

For example:

Ca2+(aq) + Na2CO3 →CaCO3(s) +2Na+(aq)

The water is softened because it no longer contains dissolved calcium ions and magnesium ions.

Explanation:

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