Which of the following methods can be used to r... - JAMB Chemistry 2023 Question
Which of the following methods can be used to remove temporary hardness from water?
A
Boiling
B
Filtration
C
Distillation
D
Chlorination
correct option: a
Temporary hardness in water is caused by the presence of bicarbonate ions (HCO₃⁻) which can be removed by boiling. When water is heated, bicarbonate ions decompose to form carbonate ions (CO₃²⁻), water, and carbon dioxide. The carbonate ions are insoluble and can be removed by precipitation.
So, the correct answer is Boiling
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