Answer :
The answers include the following:
- The type of water which does not lather easily is referred to as hard water.
- If this water contains the bicarbonate salts of calcium and magnesium then the kind of hardness the water contains is permanent hardness.
What is Hardness of water?
This is characterized by a high mineral content in the water such as dissolved calcium and magnesium and are of two types known as permanent and temporary hardness.
Hard water doesn't lather easily with soap while on the other hand soft water lathers easily with soap.
A method of removal of permanent hardness of water is by treating it with washing soda which converts it to soft water.
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