NCERT Class XI Chemistry Hydrogen Solutions
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Question : 23
Total: 36
Discuss the principle and method of softening of hard water by synthetic ion-exchange resins.
Solution:
Hard water is made soft by a very common ion exchange resin method. In this the hard water is allowed to pass over a zeolite bed [zeolites are sodium aluminium silicates ( N a 2 A l 2 S i 2 O 8 · x H 2 O ) ]
N a 2 Z + C a 2 + → C a Z + 2 N a +
N a 2 Z + M g 2 + → M g Z + 2 N a +
When whole of theN a +
MZ + 2NaCl →N a 2 Z + M C l 2
When whole of the
MZ + 2NaCl →
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