General Knowledge - Chemistry - Discussion
Discussion Forum : Chemistry - Section 1 (Q.No. 43)
43.
The method that cannot be used for removing permanent hardness of water is
Discussion:
11 comments Page 1 of 2.
Manoj said:
12 months ago
Distillation is the right answer because distillation is water purification process.
Abhijit said:
5 years ago
Permanent hardness of water cannot be removed by simple physical methods like boiling, filtering and distillation.
(1)
Faith Omowa said:
6 years ago
Boiling is the answer but caustic soda performs two functions: it removes the temporary hardness of water and also reduces permanent hardness only when the latter is slight.
Vasudev said:
7 years ago
The answers should be sodium carbonate. Boiling is used to remove temporary hardness.
(1)
Siva Rama Krishna said:
8 years ago
Thanks for all.
Tigi said:
9 years ago
Hard water contains dissolved magnesium and calcium ions. These make it more difficult for the water to form a lather with soap. Temporary hardness is caused by dissolved calcium hydrogencarbonate (which is removed by boiling). Permanent hardness is caused by dissolved calcium sulfate (which is not removed by boiling). Water can be softened using washing soda or an ion-exchange resin.
(2)
Neetu said:
9 years ago
Boling removes the temporary hardness of water not permanent hardness of water.
Shubham agrawal said:
1 decade ago
It can be removed from calgon method and washing soda, not a boiling method is used.
Jainnandish said:
1 decade ago
Boiling is right answer, because all other method remove permanent hardness of water.
Vasanthan said:
1 decade ago
Only temporary hardness producing salts{bicarbonates of ca and mg salts} are removed by boiling method.
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