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प्रश्न
What is permanent hardness of water? How can it be removed?
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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
Give reason for It is difficult to cook in hills compared to plain.
Give two examples of hydrated substances.
Name the compound responsible for temporary hardness.
Boiling removes the ................ hardness of water.
State the disadvantages of using hard water.
Give balanced equation to show how temporary hardness enters into water.
Give reason for the following:
Hardness in temporary water can be removed by boiling, but hardness in permanent hard water cannot.
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.
Write a note on ion exchange.
