Can aqua regia used for metallographic analysis be prepared with 1N hydrochloric acid?
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Can aqua regia used for metallographic analysis be prepared using 1N hydrochloric acid? As stated in the question, I only have 1N hydrochloric acid and analytically pure nitric acid available.
Aqua regia is formed by mixing 1 volume of concentrated nitric acid with 3 volumes of concentrated hydrochloric acid; both acids must be concentrated.
Aqua regia is a mixture of three parts concentrated hydrochloric acid and one part concentrated nitric acid. It is an oxidizing acid with strong chelating properties, used to dissolve certain insoluble precious metals. During the dissolution process, the high concentration of chloride ions plays a role in chelation, while nitrous chloride present in aqua regia has a strong oxidizing effect, which is used to oxidize metals into ions. Some other poorly soluble sulfides can also dissolve in aqua regia. Additionally, a mixed acid composed of three parts *ao acid and one part acid salt is called reverse aqua regia; it is a mixed acid with stronger oxidizing properties and an excellent solvent for dissolving certain metal sulfides. Any dilution will reduce the oxidizing power and chelating ability of aqua regia and hydrochloric acid, causing it to lose its original functions.
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