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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
Give reason for It is difficult to cook in hills compared to plain.
What do you understand by
Hard water
Explain with equation, what is noticed when permanent hard water is treated with Washing soda.
How will you distinguish between soft water and hard water?
Give reason for the following:
Hardness in temporary water can be removed by boiling, but hardness in permanent hard water cannot.
Using given sample of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you distinguish between hard and soft water?
Give two natural sources of hard water.
What is permanent hardness of water? How can it be removed?
Write a note on ion exchange.
Temporary hardness of water can be removed by
