Hco3

For baking soda, see sodium bicarbonate.
"Hydrogen carbonate" redirects here. For the oxoacid, see carbonic acid.

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In inorganic chemistry, bicarbonate (IUPAC-recommended nomenclature: hydrogen carbonate[1]) is an intermediate form in the deprotonation of carbonic acid. It is an anion with the chemical formula HCO3.

Bicarbonate serves a crucial biochemical role in the physiological pH buffering system.[2]

Chemical properties

The bicarbonate ion (hydrogen carbonate ion) is an anion with the empirical formula HCO3 and a molecular mass of 61.01 daltons; it consists of one central carbon atom surrounded by three oxygen atoms in a trigonal planar arrangement, with a hydrogen atom attached to one of the oxygens. It is isoelectronic with nitric acid Template:Chem/link. The bicarbonate ion carries a negative one formal charge and is the conjugate base of carbonic acid Template:Chem/link; it is the conjugate acid of Template:Chem/link, the carbonate ion, as shown by these equilibrium reactions.

CO32− + 2 H2O is in equilibrium with HCO3 + H2O + OH is in equilibrium with H2CO3 +2 OH
H2CO3 + 2 H2O is in equilibrium with HCO3 + H3O+ + H2O is in equilibrium with CO32− + 2 H3O+

A bicarbonate salt forms when a positively charged ion attaches to the negatively charged oxygen atoms of the ion, forming an ionic compound. Many bicarbonates are soluble in water at standard temperature and pressure, in particular sodium bicarbonate contributes to total dissolved solids, a common parameter for assessing water quality.

Biochemical role

Bicarbonate (HCO3) is alkaline, and a vital component of the pH buffering system[2] of the human body (maintaining acid-base homeostasis). 70-75% of CO2 in the body is converted into carbonic acid (H2CO3), which can quickly turn into bicarbonate.

With carbonic acid as the central intermediate species, bicarbonate – in conjunction with water, hydrogen ions, and carbon dioxide – forms this buffering system, which is maintained at the volatile equilibrium[2] required to provide prompt resistance to drastic pH changes in both the acidic and basic directions. This is especially important for protecting tissues of the central nervous system, where pH changes too far outside of the normal range in either direction could prove disastrous (see acidosis or alkalosis).

Bicarbonate also acts to regulate pH in the small intestine. It is released from the pancreas in response to the hormone secretin to neutralize the acidic chyme entering the duodenum from the stomach.[3]

Bicarbonate in the environment

In freshwater ecology, strong photosynthetic activity by freshwater plants in daylight releases gaseous oxygen into the water and at the same time produces bicarbonate ions. These shift the pH upward until in certain circumstances the degree of alkalinity can become toxic to some organisms or can make other chemical constituents such as ammonia toxic. In darkness, when no photosynthesis occurs, respiration processes release carbon dioxide, and no new bicarbonate ions are produced, resulting in a rapid fall in pH.

Other uses

The most common salt of the bicarbonate ion is sodium bicarbonate, NaHCO3, which is commonly known as baking soda. When heated or exposed to an acid such as acetic acid (vinegar), sodium bicarbonate releases carbon dioxide. This is used as a leavening agent in baking.

The flow of bicarbonate ions from rocks weathered by the carbonic acid in rainwater is an important part of the carbon cycle.

Bicarbonate also serves much in the digestive system. It raises the internal pH of the stomach, after highly acidic digestive juices have finished in their digestion of food. Ammonium bicarbonate is used in digestive biscuit manufacture.

Diagnostics

In diagnostic medicine, the blood value of bicarbonate is one of several indicators of the state of acid-base physiology in the body.

The parameter standard bicarbonate concentration (SBCe) is the bicarbonate concentration in the blood at a PaCO2 of 40 mmHg (5.33 kPa), full oxygen saturation and 36 °C.[4]

Bicarbonate compounds

See also

References

External links

  • Medical Subject Headings (MeSH)
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