SELECT * FROM question_mgmt as q WHERE id=3598 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=255 and ex_no='6' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science Carbon and Its Compound explain the formation of scum when hard water is t

Question:

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

Answer:

Soap does not work properly in hard water. A soap is a sodium or potassium salt of long chain carboxylic acid. Hard water contains salts of calcium and magnesium. When soap is added to hard water, sodium and potassium ions present in soap displace calcium or magnesium ions from the water molecules forming an insoluble substance called scum. A lot of soap is wasted in the process.

For example:

Sodium Stearate + Calcium chloride → Sodium chloride + Calcium Stearate (scum)

Formation of scum hinders the formation of foam, so soap is thus unable to clean in hard water.


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