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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
Define the Hard water.
What do you understand by
Soft water
What are the advantages of soft water.
Explain the permutit method for softening hard water.
Give balanced equation to show how temporary hardness in water can be removed by boiling.
Give balanced equations to show how permanent hardness in water can be removed by addition of washing soda.
Give reason for the following:
Washing soda can be used to remove both temporary and permanent hardness in water.
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?
State the causes of hardness in water.
Temporary hardness of water can be removed by
