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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 of hydrated substances.
What do you observe when Washing soda is exposed to air ?
Name the compound responsible for permanent hardness of water.
Suggest one method for the removal along with the reaction for temporary hardness.
Boiling removes the ................ hardness of water.
What do you understand by
Soft water
What are the advantages of soft water.
Explain with equation, what is noticed when permanent hard water is treated with Washing soda.
How will you distinguish between soft water and hard water?
Differentiate between Hard & soft water with suitable examples.
Give balanced equation to show how temporary hardness enters into water.
Give balanced equation to show how temporary hardness in water can be removed by boiling.
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.
Fill in the blank:
Hard and soft water can be distinguished using _____.
Explain the meaning of the terms – hard water & soft water.
Permanent hardness of water is due to the presence of _______.
What are the methods of removing hardness of water?
