![]() Solution of chloroosmic acid | |
Names | |
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IUPAC name Dihydrogen hexachloroosmate(2-) | |
Other names
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Identifiers | |
3D model (JSmol) | |
ChemSpider | |
ECHA InfoCard | 100.043.797 |
EC Number |
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PubChem CID | |
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Properties | |
Cl6H2Os | |
Molar mass | 404.95 g·mol−1 |
Appearance | Reddish-purple or black crystalline solid. [1] [2] Yields greenish yellow to reddish brown solutions [2] [3] |
Density | 5.3-5.65 g/cm3 (hexahydrate) [4] |
Melting point | decomposes [1] |
very soluble | |
Solubility | Insoluble in organic solvents [2] |
Hazards | |
GHS labelling: | |
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Danger | |
H301, H311, H314, H331 | |
P260, P261, P262, P264, P264+P265, P270, P271, P280, P301+P316, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P330, P361+P364, P363, P403+P233, P405, P501 | |
Related compounds | |
Other anions | Hexachloroplatinic acid |
Other cations | Sodium hexachloroosmate, Ammonium hexachloroosmate(IV) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Chloroosmic acid (also known as hexachloroosmic acid, and dihydrogen hexachloroosmate) is an inorganic chemical compound with the chemical formula H2OsCl6. It exists as a dark hygroscopic solid. It forms a hexahydrate. [5]
Hexachloroosmic acid can be prepared by reducing osmium tetroxide in hydrochloric acid with alcohol and heating. [3] [6]
Another way of preparing it is by dissolving osmium dioxide in hydrochloric acid. [7]
It can also be prepared by reducing potassium osmate with hydrochloric acid under heating. [2]
Solid crystals of hexachloroosmic acid have been described as reddish-purple in color, [2] while commercial vendors describe it as black. [1] [5] In solution, it exhibits colors ranging from yellowish green to reddish brown. [6] [3] [2] Owing to its highly hygroscopic nature, solutions of hexachloroosmic acid can be evaporated down to a syrup without crystallization. [3] As an acid, it is corrosive.
When strong alkali is added to hexachloroosmic acid, it decomposes and precipitates osmium dioxide. [7] [6]
It also reacts with alkali chlorides to yield hexachloroosmate salts, such as ammonium hexachloroosmate(IV). [3]