| http://www.w3.org/ns/prov#value | - Buffering capacity is the amount of resistance the pH of a water shows to additions of acid or alkali.The presence of free, i.e. uncombined, carbon dioxide tends to lower the pH because it reacts with water to form carbonic acid thus:CO2 + H2O = H2CO3Contrarily, the presence of bicarbonate anion elevates pH because it mops up hydrogen ion thus:H+ + HCO3 - = H2CO3The overall reaction is represented
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