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Carbonic acid is a chemical compound with the chemical formula H 2 C O 3. The molecule rapidly converts to water and carbon dioxide in the presence of water. However, in the absence of water, it is quite stable at room temperature. [ 5 ][ 6 ] The interconversion of carbon dioxide and carbonic acid is related to the breathing cycle of animals ...
The bicarbonate buffer system is an acid-base homeostatic mechanism involving the balance of carbonic acid (H 2 CO 3), bicarbonate ion (HCO −. 3), and carbon dioxide (CO 2) in order to maintain pH in the blood and duodenum, among other tissues, to support proper metabolic function. [1] Catalyzed by carbonic anhydrase, carbon dioxide (CO 2 ...
Being diprotic, carbonic acid has two acid dissociation constants, the first one for the dissociation into the bicarbonate (also called hydrogen carbonate) ion (HCO − 3): H 2 CO 3 ⇌ HCO − 3 + H + K a1 = 2.5 × 10 −4 mol/L; pK a1 = 3.6 at 25 °C. [19] This is the true first acid dissociation constant, defined as
Bicarbonate (HCO−. 3) is a vital component of the pH buffering system [3] of the human body (maintaining acid–base homeostasis). 70%–75% of CO 2 in the body is converted into carbonic acid (H 2 CO 3), which is the conjugate acid of HCO−. 3 and can quickly turn into it. [citation needed]
with the concentration of carbonic acid being about 0.17% that of CO 2. [19] The acid gives carbonated water a slightly tart flavor. Its pH level of between 5 and 6 [ 10 ] [ failed verification ] is approximately in between apple juice and orange juice in acidity, but much less acidic than the acid in the stomach.
The inorganic cycle begins with the production of carbonic acid (H 2 CO 3) from rainwater and gaseous carbon dioxide. [6] Due to this process, normal rain has a pH of around 5.6. [ 7 ] Carbonic acid is a weak acid , but over long timescales, it can dissolve silicate rocks (as well as carbonate rocks).
A carbonate is a salt of carbonic acid, H2CO3, [ 2 ] characterized by the presence of the carbonate ion, a polyatomic ion with the formula CO2−3. The word "carbonate" may also refer to a carbonate ester, an organic compound containing the carbonate groupO=C (−O−)2.
3 (i.e. the first acid dissociation constant for carbonic acid), K 2 is the equilibrium constant for the reaction HCO − 3 ⇌ H + + CO 2− 3 (i.e. the second acid dissociation constant for carbonic acid), and DIC is the (unchanging) total concentration of dissolved inorganic carbon in the system, i.e. [CO 2] + [HCO − 3] + [CO 2− 3].