Gold Iodide Solubility

Gold iodide (AuI) is sparingly soluble in water, with a solubility of approximately 0.0075 g/100 mL at room temperature. Its solubility increases slightly with increasing temperature and can be increased significantly by the addition of iodide ions due to the formation of complex species such as AuI2^- and AuI3^-. The solubility of gold iodide in organic solvents such as ethanol and acetone is greater than in water. It can also dissolve in concentrated hydroiodic acid due to the formation of the soluble AuI4^- ion. Overall, the solubility of gold iodide is affected by factors such as temperature, presence of other ions, and solvent polarity.