JAMB - Chemistry (2023 - No. 14)
Which of the following methods can be used to remove temporary hardness from water?
Boiling
Filtration
sedimentation
Chlorination
คำอธิบาย
Temporary hardness in water can be removed by boiling. When water is boiled, the calcium and magnesium bicarbonates decompose, forming insoluble calcium carbonate (CaCO3) and magnesium carbonate (MgCO3), which precipitate out of the water.