In permanent hardness of water, when washing soda is treated with water, ________ is precipitated out.

sodium carbonate

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magnesium carbonate

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calcium carbonate

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N a_{2} C O_{3} a n d M g C O_{3}

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Solution

The correct option is B calcium carbonate
The carbonate ions from sodium carbonate react with the calcium and magnesium ions in the water to produce insoluble product.

calcium ions + sodium carbonate → calcium carbonate + sodium ions
$C a^{+ 2} + N a_{2} C O_{3} \to C a C O_{3} + 2 N a^{+}$

The water is softened because it no longer contains dissolved calcium ions and magnesium ions, hence we can say that it is converted in soft water. It will now form lather easily with soap.

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Similar questions

Q. In permanent hardness of water, when washing soda is treated with water, calcium carbonate is precipitated out.

Q. Assertion :Permanent hardness of water can be removed by using washing soda Reason: Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates

Assertion (A): Permanent hardness of water is removed by treatment with washing soda.
Reason(R): Washing soda reacts with soluble magnesium and calcium sulphate to form water-soluble compounds.

Q. Assertion (A): Permanent hardness of water is removed by treatment with washing soda.
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Q. Boiling hard water with washing soda removes permanent hardness.

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