1.

Certain samples of water do no produce easy lather with soap. 1. What is this condition of water called? 2. Which are two types of this condition? 3. Suggest two methods to change this condition of water. 4. What are the problems caused by this condition of water?

Answer»

1. Hardwater. 

2. Temporary hardness and permanent hardness. 

3. By boiling water and by adding Na2CO3 

4. Wastage of soap and boiler explosion



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