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ChemistryChemistry
20 December, 20:36

P. ermanent hardness of water can be removed by what? (

a. adding slaked lime. (

b. boiling. (

c. adding caustic soda. (

d. filtration

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Answers (1)
  1. 20 December, 20:59
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    Temporary hardness is caused by a combination of calcium ions and bicarbonate ions in the water. It can be removed by boiling. Boiling promotes the formation of carbonate from the bicarbonate and precipitates calcium carbonate out of solution, leaving water that is softer upon cooling.
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