In strongly basic conditions, the carbonate ion predominates, while in weakly basic conditions, the bicarbonate ion predominates. In acidic conditions, aqueous CO 2 aq is the main form and is in equilibrium with carbonic acid — the equilibrium lies strongly towards carbon dioxide. Metal carbonates generally decompose upon heating, liberating carbon dioxide and leaving behind an oxide of the metal. Most salts are insoluble in water, with solubility constants K sp less than 1 x 10 -8 , with the exception of lithium, sodium, potassium, and ammonium carbonates.
Sodium carbonate is basic when dissolved in water meaning it results in a basic solution upon dissolution , and sodium bicarbonate is weakly basic. On the other hand, carbon dioxide is weakly acidic results in a slightly acidic solution when dissolved in water. Although the carbonate salts of most metals are insoluble in water, this is not true of the bicarbonate salts. Under changing temperature or pressure, and in the presence of metal ions with insoluble carbonates, the equilibrium between carbonate, bicarbonate, carbon dioxide, and carbonic acid in water can result in the formation of insoluble compounds.
This is responsible for the buildup of scale inside pipes caused by hard water. Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:. Skip to main content. Nonmetallic Elements. Search for:. Carbon Oxides and Carbonates. Learning Objective Discuss the chemical properties of oxocarbon compounds.
Key Points Carbon monoxide is the simplest carbon oxide, consisting of one carbon atom bonded to an oxygen atom. It is highly toxic. Carbon dioxide is a linear compound composed of a carbon atom bonded to two oxygen atoms. It exists predominately as a gas and is a product of the human metabolism.
Carbon dioxide is soluble in water, in which it readily and reversibly converts to carbonic acid. The conjugate bases of a carbonic acid are known as the bicarbonate and carbonate ions. Carbonates are the salts of carbonic acids. They form when a positively charged metal ion comes into contact with the oxygen atoms of the carbonate ion. These compounds are often insoluble in water and exhibit some level of basicity or acidity in aqueous solutions.
Show Sources Boundless vets and curates high-quality, openly licensed content from around the Internet. Licenses and Attributions. CC licensed content, Shared previously. Read more News Our impact Contact us Intranet. Privacy Notice and Terms of Use. ChEBI Ontology. Automatic Xrefs. ChEBI Name. A one-carbon compound in which the carbon is joined only to a single oxygen. It is a colourless, odourless, tasteless, toxic gas. Supplier Information. Molfile expand Molfile. Read full article at Wikipedia.
Average Mass. Monoisotopic Mass. Metabolite of Species. Mus musculus NCBI:txid Homo sapiens NCBI:txid See: DOI. Roles Classification.
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