Carbonic Acid: Carbonic acid is a diprotic oxyacid that is unstable, with carbon as the central atom having an oxidation state of +4. It does not exist freely due to its tendency to spontaneously decompose into Carbon dioxide and water, but its salts—Carbonates and Bicarbonates—do exist. Chemical formula: H2CO3. It is the water-bound form of Carbon dioxide. When Carbon dioxide dissolves in water, it forms this acid.
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