How Is Gold Chloride Synthesized Or Produced?

Gold chloride can be synthesized by dissolving gold in aqua regia, a mixture of hydrochloric acid and nitric acid. The resulting solution contains gold chloride along with other contaminants. To obtain pure gold chloride, the solution is typically treated with reducing agents such as sulfur dioxide or sodium metabisulfite to remove excess nitric acid and other impurities. The remaining solution can then be evaporated to concentrate the gold chloride, which can be further purified using techniques such as precipitation or solvent extraction. Alternatively, gold chloride can also be produced by reacting gold metal with chlorine gas at high temperatures.