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Byju's Answer
Standard VIII
Chemistry
Hard and Soft Water
The hardness ...
Question

The hardness of water can be detected using ______.


A

electrolysis

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B

lathering soap

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C

litmus paper

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D

thermometer

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Solution

The correct option is B

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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