Chloroplatinic acid

 

Chloroplatinic acid

Chemical formula	H2PtCl6
OTP appearance	reddish brown solid
Molar Mass(g/mol)	409.81
Density(g/cc)	2.431
Melting Point(°C)	60
NFPA 704	0 2 1

Uses

Primary

• Feedstock for platinum-based antineoplastic medicines in WHO LEM
• Intermediate in platinum refining

Production

Extraction

Occurs in placer gold at approximately 1400ppm (1.5g/kg) See Purification below and aqua regia

Purification

1. Dissolve platinum in aqua regia and evaporate

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

1. Precipitate with ammonium chloride as ammonium hexachloroplatinate
2. Pyrologically reduce to Platinum