the equations of equilibrium?
But the metal does not dissolve in concentrated nitric acid or hydrochloric acid. She dissolve, however, in aqua regia, a mixture of the two concentrated acids. The reaction products are gaseous ions and AuCl4 NO. Balancing the equation of the dissolution gold in aqua regia.
Aqua regia dissolves gold, even though the acid component will be only because, in combination, each acid performs a different task. Nitric acid is a strong oxidant, which actually dissolve a virtually undetectable amount of gold, forming gold ions (AU3 +). The hydrochloric acid provides a supply of chloride ions (Cl-), which react with gold chloraurate anions, also in the solution. Reaction with hydrochloric acid is a reaction equilibrium that favors the formation of anions chloraurate (AuCl4-). This results in the removal of gold ions from solution and the oxidation can also be made with gold, and if it dissolves the gold. Moreover, gold can be oxidized by free chlorine present in aqua regia. The equations are adequate (s) + 3 NO3-(aq) + 6 H + (aq) → AU3 + (aq) + 3 NO 2 (g) +3 H2O (l) and AU3 + (aq) + 4 Cl-(aq) → AuCl4-(ac). The oxidation reaction can also write with rust nitrate as a product instead of nitrogen dioxide: Au (s) + NO3-(aq) + 4H + (aq) → AU3 + (aq) + NO (g) + 2 H 2 O (l). Wikipedia
gold in aqua regia
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