This toxic compound is formed when powdered osmium is exposed to air.It is a very volatile, water-soluble, pale yellow, crystalline solid with a strong smell.Osmium (from Greek ὀσμή osme, "smell") is a chemical element with symbol Os and atomic number 76.It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores.
Only two osmium compounds have major applications: osmium tetroxide for staining tissue in electron microscopy and for the oxidation of alkenes in organic synthesis, and the non-volatile osmates for organic oxidation reactions.) has not yet been synthesized.
The insoluble residue, containing Ru, Os and Ir, is treated with sodium oxide, in which Ir is insoluble, producing water-soluble Ru and Os salts.
After oxidation to the volatile oxides, The first method is similar to the procedure used by Tennant and Wollaston.
Victor Collet-Descotils, Antoine François, comte de Fourcroy, and Louis Nicolas Vauquelin also observed iridium the black platinum residue in 1803, but did not obtain enough material for further experiments.
Uranium and osmium were early successful catalysts in the Haber process, the nitrogen fixation reaction of nitrogen and hydrogen to produce ammonia, giving enough yield to make the process economically successful.