![]() When CO 2 enters the blood from various cells, it is combined with water to produce carbonic acid. 2.1 pH and composition of a carbonic acid solutionĬarbonic acid plays a very important role in mammalian blood.The rate constants are 0.039 s −1 for the forward reaction (CO 2 + H 2O → H 2CO 3) and 23 s −1 for the reverse reaction (H 2CO 3 → CO 2 + H 2O). In the absence of aĬatalyst, the equilibrium is reached quite slowly. Majority of the carbon dioxide is not converted into carbonic acid and stays as CO 2 molecules. The equilibrium constant at 25☌ is K h= 1.70×10 −3: hence, the Carbonic acid should not be confused with carbolic acid, an antiquated name for phenol.Ĭarbon dioxide dissolved in water is in equilibrium with carbonic acid: The salts of carbonic acids are called bicarbonates (or hydrogencarbonates) and carbonates. ![]() It is also a name sometimes given to solutions of carbon dioxide in water, which contain small amounts of H 2CO 3. Except where noted otherwise, data are given for materials in their standard state (at 25 ☌, 100 kPa) Infobox disclaimer and referencesĬarbonic acid (ancient name acid of air or aerial acid) has the formula H 2CO 3.
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