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  • In the laboratory of a school, the sample of hard water is not available “to study the comparative cleaning capacity of a sample of soap in soft and hard water”. Which salt from the laboratory can be added to tap water to make it hard? In t

In the laboratory of a school, the sample of hard water is not available “to study the comparative cleaning capacity of a sample of soap in soft and hard water”. Which salt from the laboratory can be added to tap water to make it hard? In the experiment how is the cleaning capacity of soap compared?

 

 

 

 
 
 
 
 

Answers (1)

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Calcium and magnesium salts can be added to tap water to make it had water. The cleaning capacity of soap is compared by adding an equal amount of soap in water to two test tubes, shaking them vigorously, and comparing the length of foam or lother formed in each test tube.

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Sumit Saini

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