NCERT Question 10 - Chapter 4 Class 10 - Carbon and its Compounds

Last updated at August 14, 2026 by

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

 

Answer:

  • The hardness of water is due to the calcium and magnesium salts present in it. 
  • When the soap molecule reacts with these salts, it leads to the formation of a white precipitate which is insoluble in water and is known as scum.

FORMATION OF SCUM IN HARD WATER - Teachoo.jpg

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