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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
What is the effect on boiling point of water when pressure is increased?
Define the Soft water.
Name the compound responsible for temporary hardness.
Name the compound responsible for permanent hardness of water.
Temporary hardness of water can be removed by
Differentiate between Temporary & permanent hard water with suitable examples.
Give reason for the following:
Washing soda can be used to remove both temporary and permanent hardness in water.
A sample of water is given in a trough. State how would you prove experimentally whether the given sample is hard water or soft water.
Name the process by which temporary hardness is easily removed from the water.
Write a note on ion exchange.
