Aqua regia

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Aqua Regia (Akwuh Reejuh) is a mixture of It was named so because it can dissolve some noble metals, particularly gold and platinum. Aqua regia does not dissolve titanium, iridium, ruthenium, rhenium, tantalum, niobium, hafnium, osmium, or rhodium, and has a limited effect on silver.

Uses

Character

Reactions

  • Pt + 4 HNO3 + 6 HCl H2PtCl6 + 4 NO2 + 4 H2O (chloroplatinic acid)
  • Au + 3 HNO3 + 4 HCl HAuCl4 + 3 NO2 + 3 H2O (Chloroauric acid)

Production

  • Combine 1 ubv of azeotropic (68%) nitric acid with 3 ubv of azeotropic (22%) hydrochloric acid.

Purification

Testing

Storage

  • Sealable glass containers

Disposal

Hazards

  • Extremely corrosive

See Also