Carbonic acid

From Academic Kids

Properties
General
NameCarbonic acid
Chemical formula H2CO3

Carbonic acid is a weak acid with the chemical formula of H2CO3. It is the reaction product of water and carbon dioxide and exists in an equilibrium with water and carbon dioxide whenever the latter is dissolved in the former, for instance in soda water or blood. It is usually not possible to obtain pure hydrogen bicarbonate as the presence of even a single molecule of water causes the carbonic acid to revert to carbon dioxide and water fairly quickly. However, pure carbonic acid has been found to be quite stable in the absence of water, with a calculated half-life of 180,000 years.

Missing image
Carbonic_acid.png
Chemical structure

In solution, carbonic acid can lose one or two protons. Removing the first proton from carbonic acid forms the bicarbonate ion; removing the second proton leads to the carbonate ion.

  • H2CO3 → HCO3- + H+ (pKd = 6.35)
  • HCO3- → CO32- + H+ (pKd = 10.33)

When carbonic acid is combined with positive or basic atoms or radicals, salts called carbonates or bicarbonates can form. For instance, combined with lime (calcium oxide) it constitutes marble and chalk (calcium carbonate).

Carbonic acid is present in carbonated soft drinks. In more diluted form it plays a major part in cave formation.


External links

de:Kohlensäure eo:Karbonata acido fr:Acide carbonique nl:Koolzuur ja:炭酸 nds:Kohlensüür pl:Kwas węglowy sv:Kolsyra

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