Metal oxides

What is aqua regia? Why is Aqua regia known as royal water? How should aqua regia be stored? Why is Aqua regia so powerful

Aqua Regia 

is a mixture of nitric acid and hydrochloric acid. Aqua regia is a fuming liquid. Freshly prepared aqua regia is colorless, but it turns yellow, orange or red within seconds from the formation of nitrosyl chloride and nitrogen dioxide. It was named by alchemists because it can dissolve noble metals like gold and platinum, though not all metals.

Aqua regia is primarily used to produce chloroauric acid, the electrolyte in the Wohlwill process for refining the highest purity (99.999%) gold. Aqua Regia is also used in analytical procedures for phosphate rocks, selenium, antimony, and less soluble materials such as cobalt, arsenic, lead, mercury etc. 

Because its components react quickly, resulting in its decomposition, aqua regia quickly loses its effectiveness (yet remains a strong acid), so its components are usually only mixed immediately before use.


Packaging: Two bottles containing Reagent 1 & Reagent 2
Formula: HNO3+3HCl
Molecular Weight: 172.39 g/mol
Form: Fuming liquid. Freshly prepared aqua regia is colorless but turns yellow, orange, or red within seconds.
CAS Number: 8007-56-5
Density: 1.01–1.21 g/cm³
Synonyms: AQUA REGIA, Nitrohydrochloric acid, nitromuriatic acid, WANGSHUI, AQUA REGIS, MET-ETCH, CHLOROAZOTIC ACID, CHLORONITROUS ACID, NITROMURIATICUM ACIDUM, NITRO-HYDROCHLORIC ACID

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Aqua Regia: Properties, Uses, and Applications in the Gold Chemistry

  • Brand: Degussa
  • Availability: 50
  • 19.99€


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