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प्रश्न
Suggest one method for the removal along with the reaction for permanent hardness of water.
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उत्तर
Removal of hardness of permanent hardness of water—
By Adding sodium carbonate (washing soda)
Permanent hardness of water is removed when water is treated with a small quantity of sodium carbonate.
It reacts with the soluble chlorides and sulphates of calcium and magnesium to form their insoluble carbonates. These can be removed by filtration and then the water becomes soft. Sodium sulphate or sodium chloride formed after the reaction does not affect the soap.
\[\ce{\underset{\text{(sodium carbonate)}}{Na2CO3}+ \underset{\text{(calcium sulphate)}}{CaSO4}→\underset{\text{(insoluble calcium carbonate)}}{Na2SO4}}\]
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संबंधित प्रश्न
What is the effect on boiling point of water when pressure is increased?
What do you observe when Washing soda is exposed to air ?
What do you understand by
Soft water
Explain with equation, what is noticed when permanent hard water is treated with Washing soda.
Give balanced equations to show how permanent hardness in water can be removed by addition of washing soda.
Fill in the blank:
Hard and soft water can be distinguished using _____.
State the causes of 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.
Permanent hardness of water is due to the presence of _______.
What is the reason for the hardness of water?
