Chloroplatinic acid

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Chloroplatinic acid
Names
IUPAC name
Dihydrogen hexachloroplatinate(2–)
Other names
Chloroplatinic(IV) acid
Dihydrogen hexachloroplatinate
Hexachloroplatinic acid
Platinic chloride
Speier's catalyst
Properties
H2PtCl6
Molar mass 409.81 g/mol
Appearance Reddish-brown solid
Density 2.431 g/cm3
Melting point 60 °C (140 °F; 333 K) (decomposes)
Boiling point Decomposes
Very soluble
Solubility Soluble in acetone, diethyl ether, ethanol, ethyl acetate
Insoluble in nitric acid
Hazards
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).
Infobox references

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.

Properties

Chemical

Chloroplatinic acid breaks down to platinum(II) chloride when heated to high temperatures.

Physical

Hexachloroplatinic acid is a reddish-brown solid.

Availability

Hexachloroplatinic acid is sold by chemical suppliers, but it's expensive.

Preparation

Chloroplatinic acid can be made by dissolving platinum metal in aqua regia:

Pt + 4 HNO3 + 6 HCl → H2PtCl6 + 4 NO2 + 4 H2O

Projects

  • Platinum extraction
  • Make platinum compounds
  • Catalyst
  • Determination of potassium

Handling

Safety

Chloroplatinic acid is harmful if ingested.

Storage

Chloroplatinic acid should be kept in closed bottles, in a closed locker.

Disposal

Should be reduced to elemental platinum and recycled.

References

Relevant Sciencemadness threads