Advertisements
Advertisements
प्रश्न
Give reason for the following:
Hardness in temporary water can be removed by boiling, but hardness in permanent hard water cannot.
Temporary hardness in water can be removed by boiling.
Advertisements
उत्तर १
Temporary hardness is due to the presence of bicarbonate of calcium or magnesium, on boiling bicarbonate decomposes to CO2, carbonate which is in soluble and can be filtered out. Where as permanent hard water contains [SO2]2- or Cl–– of calcium and magnesium, cannot be removed by boiling.
उत्तर २
Temporary hardness in water is due to the presence of HCO3 of calcium or magnesium.
On boiling bicarbonate changes to carbonate which is insoluble in water and is filtered out, CO2 gas escapes and water becomes soft.
संबंधित प्रश्न
What is the effect on boiling point of water when impurity is added.
Give two examples of hydrated substances.
Suggest one method for the removal along with the reaction for temporary hardness.
Name three water borne diseases.
What do you understand by
Soft water
What do you understand by
Hard water
State the disadvantages of using hard water.
Explain the permutit method for softening hard water.
State the causes of hardness in water.
Give two natural sources of hard 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.
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 _______.
Temporary hardness of water can be removed by ________ of water.
What are the methods of removing hardness of water?
What is permanent hardness of water? How can it be removed?
Temporary hardness of water can be removed by
