Chloroauric acid

Chloroauric acid is also called “gold chloride” and “gold chloride tetrahydrate”. Chemical formula HAuCl4·4H2O. Molecular weight 411.85. Yellow needle-shaped crystals. Toxic! Corrosive. Easily soluble in water, ethanol, ether, slightly soluble in chloroform. Anhydrous chloroauric acid can be crystallized from ethanol solution. It can be used for local gold plating of semiconductor and integrated circuit lead frames, printed circuit boards, and electronic connectors.