Explain the composition of aqua regia as a mixture.

1 part of concentrated nitric acid and 3 parts of concentrated hydrochloric acid.

Aqua regia

Aqua regia is a mixture of hydrochloric acid (HCl) and nitric acid (HNO3) at a ratio of either 3:1 or 4:1. It is a reddish-orange or yellowish-orange fuming liquid. The term is a Latin phrase, meaning king’s water. Aqua Regia or nitro-hydrochloric acid is a highly corrosive mixture of acids; it can dissolve metals like gold and platinum. It is a fuming yellow or red solution.

  • Aqua regia is primarily used to produce chloroauric acid
  • used to dissolve gold and platinum.

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