The hardness of water can be detected using -Dilute -Zn-Cu couple-Scum formed by lathering soap-

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Byju's Answer

Standard VIII

Chemistry

Disadvantages of Hardness

The hardness ...

Question

The hardness of water can be detected using ______.

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Scum formed by lathering soap

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Dilute

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Zn-Cu couple

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Solution

The correct option is B
Scum formed by lathering soap

When soap is used with water it forms the lather. If calcium or magnesium ions are present in water (hardness) they tend to form scum with soap and as a result, lather formed is lower than that compared to soft water. Hence, the hardness of water can be detected by lathering soap.

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Similar questions

Soap does not form lather with hard water:-

Q. Soap form lathers in hard water, but a detergent does not.

Q. While washing clothes in hard water,
(a) soap forms lather.
(b) small amount of soap is used.
(c) large amount of soap is used.
(d) soap gives a clear solution.

Choose the correct option.
Assertion (A): Hard water gives lather with soap easily.
Reason (R): Salts of sodium and magnesium present in hard water react with soap to form insoluble salts.

Hard water gives a rich lather with soap.

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