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Home / Tips and Tricks / The acid mixture "Aqua Regia" derives its name from the ability to dissolve?

The acid mixture "Aqua Regia" derives its name from the ability to dissolve?



  Gold that dissolves on the bottom of a test tube filled with aqua regia.
Daniel Grohmann / Wikimedia

Answer: Gold

Royal water, literally "royal water" or "royal water", is formally known as nitro-hydrochloric acid (the IUPAC name is nitric acid hydrochloride) and is one of the more caustic Acid mixtures that exist. The mixture derives its Latin name from its ability to dissolve the precious metals gold and platinum.

It is able to dissolve the normally acid-resistant precious metals, a performance that the base acids of which it consists are not able to do so, because every acid in the nitro-hydrochloric acid mixture fulfills a certain function. In the case of gold, the nitric acid oxidizes the gold to gold ions, while the hydrochloric acid provides chloride ions; With enough time and acidity, the gold is finally completely dissolved in hydrochloric acid. The process can be reversed and the gold can be extracted from the mixture. A similar process takes place with platinum, but instead chloroplatinic acid is generated.

Königswasser was the mode of discovery for the dense metals iridium and osmium; The two metals are in platinum ore, but do not dissolve in the mixture and instead collect at the bottom of the container.

The main applications of aqua regia today are gold refining, industrial etching and specific analysis methods. [1

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