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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.
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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 pressure is increased?
Give two examples for Efflorescent substance.
Define the Hard water.
Name the compound responsible for temporary hardness.
Suggest one method for the removal along with the reaction for permanent hardness of water.
Boiling removes the ................ hardness of water.
Temporary hardness of water can be removed by
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?
Differentiate between Hard & soft water with suitable examples.
Differentiate between Temporary & permanent hard water with suitable examples.
Give balanced equation to show how temporary hardness enters into water.
Give reason for the following:
Washing soda can be used to remove both temporary and permanent hardness in 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.
Permanent hardness of water is due to the presence of _______.
What is permanent hardness of water? How can it be removed?
What is the reason for the hardness of water?
