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.
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 reason for It is difficult to cook in hills compared to plain.
Give two examples of hydrated substances.
What do you observe when Washing soda is exposed to air ?
What do you understand by
Soft water
What are the advantages of soft water.
What are the advantages of hard water.
Explain with equation, what is noticed when permanent hard water is treated with Washing soda.
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 in water can be removed by boiling.
Give balanced equations to show how permanent hardness in water can be removed by addition of washing soda.
Using given sample of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you distinguish between hard and soft water?
Explain the meaning of the terms – hard water & 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.
Temporary hardness of water can be removed by ________ of water.
What are the methods of removing hardness of water?
What is the reason for the hardness of water?
