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Molecular formula CO2−
Molar mass 60.01 g mol-1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

A carbonate is a chemical compound that has the carbonate ion, CO2−
. This ion is made of carbon and oxygen. The name may also mean an ester of carbonic acid, an organic compound containing the carbonate group C(=O)(O–)2 of carbon and oxygen. They have a valency of 1.

When added to an acid, a carbonate will produce carbon dioxide, water and a chemical salt. Sedimentary rocks containing calcite and other carbonates are plentiful in the earth.

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