Preparation of Ag2[HgI4]
In 25 ml of water dissolve 3.3 g of potassium iodide, add 4.5 g of mercuric iodide. To the resulting solution are added with stirring a solution of 3.4 g of silver nitrate in 25 ml of water. Exclude dark yellow precipitate tetrajodortuťnatanu silver. Product was filtered on a Buchner funnel, rinse with 100 ml of water and dry at 40 ° C.
HgI2 + 2KI + 2AgNO3 ==> Ag2[HgI4] + 2KNO3