Ammonium hexachloroplatinate

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Ammonium hexachloroplatinate
IUPAC name Ammonium hexachloroplatinate(IV)
Identifiers
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Properties
(NH4)2PtCl6
Molar mass 443.87 g/mol
Density 3.07 g/cm3
Melting point
Solubility in other solvents 0.5 g/100 mL (20 °C)
3.365 g/100 mL (100 °C)
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references


Overview

Ammonium hexachloroplatinate, also known as ammonium chloroplatinate, is an inorganic compound with the formula (NH4)2PtCl6. It is a rare example of a soluble platinum(IV) salt that is not hygroscopic. It forms intensely yellow solutions in water. In the presence of 1M NH4Cl, its solubility is only 0.0028g/100 mL.

Preparation and structure

The compound consists of separate ammonium cations and octahedral [PtCl6]2- anions. It is usually generated by treating a solution of chloroplatinic acid with a solution of an ammonium salt.[1] The fine yellow salt precipitates. The complex is so poorly soluble that this step is employed in the isolation of platinum from ores and recycled residues.[2]

Uses and reactions

This yellow powder is used in platinum plating.

Heating (NH4)2PtCl6 under a stream of hydrogen at 200 °C produces platinum sponge. Treatment with chlorine gives H2PtCl6.[1]

References

  1. 1.0 1.1 Kauffman, G. B. "Ammonium Hexachloroplatinate" Inorganic Syntheses McGraw-Hill: New York, 1967, IX, pages 182-4.
  2. Cotton, S. A. Chemistry of Precious Metals, Chapman and Hall (London): 1997. ISBN 0-7514-0413-6.



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