Mixed anion compounds

Sulfite sulfate

A sulfite sulfate is a chemical compound that contains both sulfite and sulfate anions [SO3]2βˆ’ [SO4]2βˆ’. These compounds were discovered in the 1980s as calcium and rare earth element salts. Minerals in this class were later discovered. Minerals may have sulfite as an essential component, or have it substituted for another anion as in alloriite. The related ions [O3SOSO2]2βˆ’ and [(O2SO)2SO2]2βˆ’ may be produced in a reaction between sulfur dioxide and sulfate and exist in the solid form as tetramethyl ammonium salts. They have a significant partial pressure of sulfur dioxide. Related compounds are selenate selenites and tellurate tellurites with a varying chalcogen. They can be classed as mixed valent compounds. (Wikipedia).

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Related pages

Sulfate | Sulfite | Selenate selenite