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Which of the following methods can be used to remove the temporary hardness of water?
Option: 1
Boiling
Option: 2
Ion exchange
Option: 3
Reverse osmosis
Option: 4
Adding lime
Answers (1)
Temporary hardness of water is caused by the presence of bicarbonate ions in the water, which can be removed by boiling the water. When water is boiled, the bicarbonate ions decompose to form carbonate and water, which are not harmful. However, boiling does not remove permanent hardness, which requires other methods such as ion exchange, reverse osmosis, or adding lime.
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