How are bicarbonates added to water? How can they be removed by boiling? Give equations.

Explanation

The presence of bicarbonates in water results due to the dissolution of `CO_(2)` gas in rain water. This water flows across a wide area with different types of rocks. Calcium carbonate and magnesium carbonate present in the rocks react with the water containing `CO_(2)` there by forming the corresponding bicarbonates. Bicarbonates being highly soluble in water imparts hardness to water. The hardness caused by these bicarbonate salts is called temporary hardness.
When the water containing temporary hardness is subjected to boiling these bicarbonates get converted to insoluble carbonates and can be removes by filtration.
`Ca(HCO_(3))_(2) rarr CaCO_(3) + H_(2)O + CO_(2)`
`Mg(HCO_(3))_(2) rarr MgCO_(3) + H_(2)O + CO_(2)`