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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
Give two examples for Efflorescent substance.
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Suggest one method for the removal along with the reaction for permanent hardness of water.
Boiling removes the ................ hardness of water.
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Hard and soft water can be distinguished using _____.
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Name the process by which temporary hardness is easily removed from the water.
Temporary hardness of water can be removed by
