Combine 3 g of gold, 20 mL of conc. HCl and 4 mL of conc. nitric acid, start heating the solution until all of the gold reacts. Remove the water with a vacuum desiccator.
Au + HNO3 + 4 HCl → HAuCl4 + NO + 2 H2O
The gold is reacting with the acids
All of the gold has reacted with the acids
The hydrated product