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प्रश्न
Suggest one method for the removal along with the reaction for permanent hardness of water.
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 is the effect on boiling point of water when impurity is added.
What do you observe when Washing soda is exposed to air ?
Name the compound responsible for permanent hardness of water.
Name three water borne diseases.
What do you understand by
Hard water
What are the advantages of soft water.
State the disadvantages of using hard water.
Give balanced equations to show how permanent hardness in water can be removed by addition of washing soda.
What are the methods of removing hardness of water?
