Explain the formation of scum when hard water is treated with soap.

Question

TextHard Water and Its Effect on Soaps

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Would you be able to check if water is hard by using a detergent?

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You want to test for hardness of water but hard water is not available in the laboratory. Which of the following compounds may be dissolved in pure water to make it hard ?

MCQ (Single)

Hard Water and Its Effect on Soaps

Take two test tubes X and Y with 10 mL of hard water in each. In test tube 'X', add few drops of soap solution and in test tube Y add a few drops of detergent solution. Shake both the test tubes for the same period. (a) In which test tube the formation of foam will be more ? Why? (b) In which test tube is a curdy solid formed? Why?

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