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
Name the compound responsible for temporary hardness.
Suggest one method for the removal along with the reaction for temporary hardness.
What do you understand by
Soft water
Explain the permutit method for softening hard water.
How will you distinguish between soft water and hard water?
Give balanced equation to show how temporary hardness enters into water.
Give reason for the following:
Hardness in temporary water can be removed by boiling, but hardness in permanent hard water cannot.
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.
Two samples of water are placed in a beaker individually. State how you will determine experimentally which of the two samples contains permanent hard water.
Permanent hardness of water is due to the presence of _______.
