We dissolve gold into aqua regia (a mixture of nitric acid and hydrochloric acid) for the first of our extra "Molecular Videos" series. More chemistry...
Got some Aqua Regia, and a Pencil Sharpener ***EDIT*** Guys... How's about, instead of posting questions which have already been answered repeatedly, you either: 1)...
Refining gold. Scrap jewelry gold is first dissolved in Aqua Regia. The liquid is filtered removing the silver. Video shows: Gold precipitate from the acid...