aqua regia
mixture of nitric acid and hydrochloric acid, in a molar ratio of 1:3
AI overview
Aqua regia is a highly corrosive mixture of nitric acid and hydrochloric acid that has remarkable dissolving power. It matters because it can dissolve noble metals like gold and platinum, which resist most other acids, making it historically important for refining precious metals and testing their purity.
AI-generated from the Wikipedia summary — may contain errors.
Article
Freshly prepared aqua regia to remove metal salt deposits Freshly prepared aqua regia is colorless, but it turns orange within seconds. Here, fresh aqua regia has been added to these NMR tubes to remove all traces of organic material. Aqua regia (/ˈreɪɡiə, ˈriːdʒiə/; from Latin, "regal water" or "royal water") is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a fuming liquid. Freshly prepared aqua regia is colorless, but it turns yellow, orange, or red within seconds from the formation of nitrosyl chloride and nitrogen dioxide. It was so named by alchemists because it can dissolve noble metals, such as gold and platinum, while leaving many other metals unaffected. It has been used to process or conceal gold into the modern era.
Preparation and decomposition