Question

Which type of hardness is removed by the following:
(i) boiling _____________
(ii) ion exchange method. ______________

Answer 1

¡) temporary hardness

¡¡)non carbonate hardness

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Answer 2

Answer:

The ‘Type of hardness’ which is removed by the following:

(i) “Boiling Temporary hardness”.

(ii) “Ion exchange method Permanent hardness”.

Explanation:

• Boiling the water will cause “solid calcium carbonate” or “solid magnesium carbonate” to form precipitate it can be easily removed by the filtration.
• The exchange of “calcium and magnesium ions” for sodium ions in an ‘ion-exchange column’ can be also used for the “remove permanent hardness” from water.
• In this process, borax is used to ‘reduce the alkalinity’ of water.