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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?
What is the effect on boiling point of water when impurity is added.
Give two examples of hydrated substances.
Give two examples for Efflorescent substance.
Name the compound responsible for permanent hardness of water.
Temporary hardness of water can be removed by
What do you understand by
Hard water
What are the advantages of soft water.
How will you distinguish between soft water and hard water?
Give balanced equation to show how temporary hardness enters into water.
Give balanced equations to show how permanent hardness in water can be removed by addition of washing soda.
Explain the meaning of the terms – hard water & soft water.
State the causes of hardness in water.
Permanent hardness of water is due to the presence of _______.
Temporary hardness of water can be removed by ________ of water.
Name the process by which temporary hardness is easily removed from the water.
What is the reason for the hardness of water?
Temporary hardness of water can be removed by
