Aqua regia

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Aqua regia[note 1]
CAS number 8007-56-5
PubChem 62687
Jmol-3D images Image 1
Molecular formula HNO3+3 HCl
Appearance reid, yellae or gowd fumin liquid
Density 1.01–1.21 g/cm3
Meltin pynt

−42 °C

Boilin pynt

108 °C

Solubility in water miscible in watter
Vapor pressure 21 mbar
NFPA 704
NFPA 704.svg
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Aqua regia (Laitin an Auncient Italian, lit. "regal watter"), aqua regis (Laitin, lit. "king's watter"), or nitro-hydrochloric acid is a heichly corrosive mixture o acids, a fumin yellae or reid solution. The mixture is furmed bi freshly mixin concentratit nitric acid an hydrochloric acid,[1] optimally in a volume ratio o 1:3. It wis named so acause it can dissolve the so-cried ryal or noble metals, gowd an platinum. However, titanium, iridium, ruthenium, tantalum, osmium, rhodium an a few ither metals are capable o wistandin its corrosive properties.[2]

Notes[eedit | eedit soorce]

  1. The information in the infobox is anly accurate if the volume ratio o nitric acid tae hydrochloric acid is 1:3.

References[eedit | eedit soorce]

  1. The acid concentrations in water differ, and indicative values could be 65% w/v for nitric acid and 35% w/v for hydrochloric acid — that is, the actual HNO3:HCl mass ratio is less than 1:2,
  2. Encyclopædia Britannica Online. "Aqua regia".