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Question : 134 of 160
Marks:
+1 ,
-0
Solution:
Hard water does not produce lather with soap is called hard water.
Hardness is due to the presence of bicarbonate, chlorides and sulphates of
C a and
M g .
M 2 + + 2 C 17 H 35 C O O N a ─ ─ ─ ─ ▶ ( C 17 H 35 C O O ) 2 M + 2 N a + ( M = C a 2 + , M g 2 + )
C a 2 + or
M g 2 + ion present in hard water react with soap to form precipitate of Ca and Mg salt of fatty acids and hence, no lather is produced.
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