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Aqua regia

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Aqua regia[note 1]
IUPAC name
nitric acid hydrochloride
Ither names
aqua regis, nitrohydrochloric acid
3D model (JSmol)
HNO3+3 HCl
Appearance reid, yellae or gowd fumin liquid
Density 1.01–1.21 g/cm3
Meltin pynt −42 °C (−44 °F; 231 K)
Bylin pynt 108 °C (226 °F; 381 K)
miscible in watter
Vapour pressur 21 mbar
NFPA 704
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 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 mixtur o acids, a fumin yellae or reid solution. The mixtur is furmed bi freshly mixin concentratit nitric acid an hydrochloric acid,[1] optimally in a vollum ratio o 1:3. It wis named sae acause it can dissolve the sae-cried ryal or noble metals, gowd an platinum. Houiver, 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 molar 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".