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What is aqua regia, and how is it prepared?

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Aqua regia is a mixture of concentrated hydrochloric acid and concentrated nitric acid. It is prepared by mixing these two acids together in specific proportions.

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  1. Aqua regia is a highly corrosive mixture of concentrated nitric acid (HNO₃) and concentrated hydrochloric acid (HCl). It is known for its ability to dissolve noble metals like gold and platinum, which resist dissolution by individual acids. The preparation involves mixing three parts hydrochloric acid with one part nitric acid, usually in a fume hood due to the release of toxic fumes. The combination of these acids forms a powerful and versatile solvent capable of dissolving a wide range of metals, making aqua regia widely used in metallurgy and analytical chemistry for metal dissolution and analysis.

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