CBSE Class 10 Science
Question 10 of 28
Carbon and its Compounds — Question 10
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Question Question 10
Explain the formation of scum when hard water is treated with soap.
Hardness of water is due to the presence of calcium and magnesium salts. When soap molecules react with these salts, they form a precipitate which appears as a floating off-white layer over water and is called as scum.