Alkalinity is the ability of water to neutralize acids. The measure is important in determining how buffered the water is against changes in pH levels.

The important compounds in determining alkalinity level is the carbonate (CO32-) and bicarbonate (HCO3-) ions. Bicarbonate ions are able to neutralize hydroxide ions present in water and Carbonite ions are able to react with and neutralize 2 hydrogen ions.

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