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Purified chloroplatinic acid
| IUPAC name
| Other names
|Molar mass||409.81 g/mol|
|Appearance||Reddish-brown solid, hygroscopic|
|Melting point||60 °C (140 °F; 333 K) (decomposes)|
|Solubility|| Soluble in acetone, diethyl ether, ethanol, ethyl acetate|
Insoluble in nitric acid
|Safety data sheet||Sigma-Aldrich (hydrate)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Chloroplatinic acid or hexachloroplatinic acid is an inorganic compound obtained by dissolving platinum metal in aqua regia. Although often written in shorthand as H2PtCl6, it is the hydronium (H3O+) salt of the hexachloroplatinate anion (PtCl2−
6). The compound is also available as the hexahydrate.
Chloroplatinic acid breaks down to platinum(II) chloride when heated to high temperatures.
Hexachloroplatinic acid is a reddish-brown solid, very hygroscopic.
Hexachloroplatinic acid is sold by chemical suppliers, but it's expensive.
Chloroplatinic acid can be made by dissolving platinum metal in aqua regia:
- Pt + 4 HNO3 + 6 HCl → H2PtCl6 + 4 NO2 + 4 H2O
- Platinum extraction
- Make platinum compounds
- Determination of potassium
Chloroplatinic acid is harmful if ingested.
Chloroplatinic acid should be kept in closed bottles, in a closed locker.
Should be reduced to elemental platinum and recycled.