Advertisements
Advertisements
प्रश्न
Suggest one method for the removal along with the reaction for permanent hardness of water.
Advertisements
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.
\[\ce{\underset{\text{(sodium carbonate)}}{Na2CO3}+ \underset{\text{(calcium sulphate)}}{CaSO4}→\underset{\text{(insoluble calcium carbonate)}}{Na2SO4}}\]
APPEARS IN
संबंधित प्रश्न
Give two examples for Efflorescent substance.
Define the Hard water.
Suggest one method for the removal along with the reaction for temporary hardness.
Name three water borne diseases.
Explain the permutit method for softening hard water.
Explain with equation, what is noticed when permanent hard water is treated with 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 prove the advantage of detergent over soap.
Explain the meaning of the terms – hard water & soft 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.
