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प्रश्न
What is permanent hardness of water? How can it be removed?
उत्तर
The hardness due to the presence of chloride and sulphate salts of calcium and magnesium is known as the permanent hardness of the water.
Removal of hardness:
- Adding washing soda.
- Washing soda is used to remove the permanent hardness of the water.
- It converts chlorides and sulphates into insoluble carbonates.
- These insoluble carbonates are removed by filtration.
- Distillation
- Temporary and permanent hardness both can be removed by the method of distillation.
- The water obtained after distillation is called distilled water.
- It is the purest form of water.
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संबंधित प्रश्न
What do you observe when Washing soda is exposed to air ?
Temporary hardness of water can be removed by
What do you understand by
Hard water
How will you distinguish between soft water and hard water?
Give reason for the following:
Washing soda can be used to remove both temporary and permanent hardness in water.
Two samples of water are placed in a beaker individually. State how you will determine experimentally which of the two samples contains permanent hard water.
Temporary hardness of water can be removed by ________ of water.
What are the methods of removing hardness of water?
Write a note on ion exchange.
What is the reason for the hardness of water?
