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  2. Aqua regia - Wikipedia

    en.wikipedia.org/wiki/Aqua_regia

    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 ...

  3. Gold parting - Wikipedia

    en.wikipedia.org/wiki/Gold_parting

    Silver was removed by filtering and gold was then recovered by evaporating the liquid and heating the residue. Nitric acid was suitable for separating small quantities of gold from silver and aqua regia used to separate small quantities of silver from gold. Aqua regia acid process is used by refiners of scrap gold used in jewelry manufacturing.

  4. Gold compounds - Wikipedia

    en.wikipedia.org/wiki/Gold_compounds

    Gold is unaffected by most acids. It does not react with hydrofluoric, hydrochloric, hydrobromic, hydriodic, sulfuric, or nitric acid. It does react with selenic acid, and is dissolved by aqua regia, a 1:3 mixture of nitric acid and hydrochloric acid. Nitric acid oxidizes the metal to +3 ions, but only in minute amounts, typically undetectable ...

  5. Acid test - Wikipedia

    en.wikipedia.org/wiki/Acid_test

    A visualization of the aqua fortis (nitric acid) and aqua regia acid tests on zinc, copper, silver, and gold. Testing for gold with acid capitalizes on gold's status as a noble metal, resistant to corrosion, oxidation, or acid. The procedure includes rubbing the gold-colored item on black stone, leaving a visible mark.

  6. List of alchemical substances - Wikipedia

    en.wikipedia.org/wiki/List_of_alchemical_substances

    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.

  7. Gold (III) chloride - Wikipedia

    en.wikipedia.org/wiki/Gold(III)_chloride

    AuCl 3 is a Lewis acid and readily forms complexes. For example, it reacts with hydrochloric acid to form chloroauric acid (H[AuCl 4]): [15] HCl + AuCl 3 → H + + [AuCl 4] −. Chloroauric acid is the product formed when gold dissolves in aqua regia. [15] On contact with water, AuCl 3 forms acidic hydrates and the conjugate base [AuCl 3 (OH)] −.

  8. The 9 Best Lactic Acid Serums That Will Leave Skin Glowing - AOL

    www.aol.com/lifestyle/9-best-lactic-acid-serums...

    UNSPOTTED 4X® Acid Jelly Night Serum. The "4X" in this serum's name is thanks to the 15 percent blend of lactic, azelaic, glycolic, and tranexamic acids, which together help reduce the appearance ...

  9. Piranha solution - Wikipedia

    en.wikipedia.org/wiki/Piranha_solution

    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