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Oxysalts are a class of chemical compounds that contain an oxyanion. An oxyanion is an ion consisting of an oxygen atom and at least one other element in a chemical compound, where the oxygen atom is bonded to the other element or elements. Common examples of oxyanions include nitrate (NO3-), sulfate (SO42-), and carbonate (CO32-). Therefore, oxysalts are salts formed by the combination of a cation (a positively charged ion) and an oxyanion.

The chemical properties of oxysalts are largely determined by the nature of the oxyanion. For instance, the stability and reactivity of the oxyanion can influence the overall behavior of the oxysalt. Many oxysalts are soluble in water, although solubility varies greatly depending on the specific cation and anion involved. For example, sodium nitrate (NaNO3) is highly soluble, while barium sulfate (BaSO4) is practically insoluble.

Oxysalts are widespread in nature and have numerous applications. Many minerals are oxysalts, such as calcite (calcium carbonate) and gypsum (calcium sulfate dihydrate). In industry, oxysalts are used in a variety of processes. For example, nitrates are used in fertilizers and explosives, sulfates are used in paper production and as drying agents, and carbonates are used in glassmaking and as antacids. The study of oxysalts is a fundamental part of inorganic chemistry due to their abundance and diverse functionalities.