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Aqua regia (/ ˈ r eɪ ɡ i ə, ˈ r iː dʒ i ə /; from Latin, "regal water" or "royal water") is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. [b] 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 ...
It is a yellow gas that is commonly encountered as a component of aqua regia, a mixture of 3 parts concentrated hydrochloric acid and 1 part of concentrated nitric acid. It is a strong electrophile and oxidizing agent. It is sometimes called Tilden's reagent, after William A. Tilden, who was the first to produce it as a pure compound. [1]
Aqua regia (HNO 3 + 3 HCl) Chromic acid (H 2 CrO 4) Fenton's reagent (H 2 O 2 + Fe 2+) Green death (xH 2 SO 4 + yHCl + zFeCl 3 + wCuCl 2) Peroxydisulfuric acid, or Marshall's acid (H 2 S 2 O 8) Peroxymonosulfuric acid, or Caro's acid (H 2 SO 5) Plasma etching; RCA clean (silicon wafer cleaning procedure) Superhydrophilicity; Ultrahydrophobicity
Animation of a strong acid–strong base neutralization titration (using phenolphthalein).The equivalence point is marked in red. In chemistry, neutralization or neutralisation (see spelling differences) is a chemical reaction in which acid and a base react with an equivalent quantity of each other.
Potassium metabisulfite is sometimes used to precipitate gold from solution in aqua regia (as an alternative to sodium sulfite). It is a component of certain photographic developers and solutions used in photographic processing, keeping active developing species from contact with oxygen. [6]
Aqua regia (Latin: "royal water") – a mixture of aqua fortis and spirit of salt. Aqua tofani – arsenic trioxide, As 2 O 3 (extremely poisonous) Aqua vitae /aqua vita/spirit of wine, ardent spirits – ethanol, formed by distilling wine [2] Butter (or oil) of antimony – antimony trichloride.
Platinum being dissolved in hot aqua regia. Hexachloroplatinic acid may be produced via a variety of methods. The most common of these methods involves dissolution of platinum in aqua regia. Other methods include exposing an aqueous suspension of platinum particles to chlorine gas, or via electrolysis.
Chloroauric acid is produced by dissolving gold in aqua regia (a mixture of concentrated nitric and hydrochloric acids) followed by careful evaporation of the solution: [15] [16] Au(s) + HNO 3 (aq) + 4 HCl(aq) → H[AuCl 4](aq) + NO(g) + 2 H 2 O(l) Under some conditions, oxygen can be used as an oxidant. [17]