Coldsore – Pollutant 4 (cass)



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Coldsore – Pollutant 4 (cass)

Aqua regia dissolves gold, though neither constituent acid will do so alone, because, in combination, each acid performs a different task. Nitric acid is a powerful oxidizer, which will actually dissolve a virtually undetectable amount of gold, forming gold ions. The hydrochloric acid provides a ready supply of chloride ions, which react with the gold ions to produce tetrachloroaurate anions, also in solution. The reaction with hydrochloric acid is an equilibrium reaction that favors formation of chloroaurate anions. This results in a removal of gold ions from solution and allows further oxidation of gold to take place. The gold dissolves to become chloroauric acid. In addition, gold may be dissolved by the chlorine present in aqua regia. Appropriate equations are:If the aqua regia solution only contains gold, solid tetrachloroauric acid may be prepared by boiling off excess aqua regia, and removing residual nitric acid by repeatedly heating with hydrochloric acid. That step reduces nitric acid (see decomposition of aqua regia). If elemental gold is desired, it may be selectively reduced with sulfur dioxide, hydrazine, oxalic acid, etc.


grey C-40 tape with a shell made from recycled material (some marbled), hand-dubbed, in plastique film envelope and printed full color inlay card. limited run of 30 stamped and numbered copies.

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