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प्रश्न
Give balanced equations to show how permanent hardness in water can be removed by addition of washing soda.
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उत्तर
Removal of permanent hardness in water by adding washing soda : CaCl2 or CaSO4 present in permanent hard water exchanges the ions and forms CaCO3 which being in soluble can be filtered.
\[\ce{\underset{\text{Washing soda}}{Na2CO3} + \underset{\text{Present in hard work}}{CaSO4} -> CaCO3↓ + Na2SO4}\]
\[\ce{Na2CO3 + CaCl2 -> CaCO3↓ + 2NaCl}\]
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संबंधित प्रश्न
Name the compound responsible for permanent hardness of water.
Suggest one method for the removal along with the reaction for permanent hardness of water.
Give balanced equation to show how temporary hardness enters into water.
Give reason for the following:
Hardness in temporary water can be removed by boiling, but hardness in permanent hard water cannot.
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.
State the causes of hardness in water.
Give two natural sources of hard 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.
Permanent hardness of water is due to the presence of _______.
Name the process by which temporary hardness is easily removed from the water.
