Buffer A buffer is an aqueous solution that resists changes in pH upon the addition of an acid or a base . Also, adding water to a buffer or allowing water to evaporate from the buffer does not change the pH of a buffer significantly. Buffers basically constituent a pair of a weak acid and its conjugate base, or a pair of a weak base and its conjugate acid. Blood buffer The bicarbonate buffer system is an acid-base homeostatic mechanism involving the balance of carbonic acid (H 2 CO 3 ), bicarbonate ion (HCO3-), and carbon dioxide (CO 2 ) in order to maintain pH in the blood and duodenum , among other tissues, to support proper metabolic function. Catalyzed by carbonic anhydrase , carbon dioxide (CO 2 ) reacts with water (H 2 O) to form carbonic acid (H 2 CO 3 ), which in turn rapidly dissociates to form a bicarbonate ion (HCO3-) and a hydrogen ion (H + ) as shown in the following reaction. C O 2 + H 2 O ⇄ H 2 C O 3 ⇄ H C O 3 − + H + {\displaystyle {\rm {CO_...
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