Preparation of mercury(II) iodide
A solution of 13.5 g of mercury(II) chloride in 150 ml of water is mixed with one of 16.6 g of potassium iodide in 200 ml of water. The red mercury(II) iodide is suction-filtered, washed well with 100 ml of water, and dried in a desiccator. The dry material (about 22.5 g) is placed in a 4-inch evaporating dish, embedded about three-quarters of its height in a sand bath, and covered with a 5-inch Petri dish (or watch glass). On heating the bath, the mercury(II) iodide sublimes as yellow vapors which condense on the cover as a mixture of red and yellow prisms up to 2 cm long. The sublimated mercury(II) iodide is removed by periodically changing the Petri dish or watch glass. Finally, only a slight grayish residue of impurities remains behind. The yield of mercury(II) iodide is 21-22 g. The yellow modification of mercury(II) iodide changes slowly to the red one; the process is hastened by scratching or tapping the crystals.
Inorganic laboratory preparations, by G. G. Schlessinger, 24-25, 1962
HgI2, mercuric diiodide, mercuric iodide, mercuric iodide, red
Mercury diiodide, Mercury(II) iodide, MERCURIC IODIDE, Mercury iodide (HgI2), Mercury biniodide, Mercurius bijodatus, Hydrargyrum diodatum, Red mercuric iodide, Mercuric iodide, red, alpha-Mercury(II) iodide, 7774-29-0, MERCURY (II) IODIDE, Hydrargyrum bijodatum [German], HSDB 1211, Mercuric iodide red, EINECS 231-873-8, Mercury(II) iodide red, diiodomercury, Hydrargyrum bijodatum, HgI2, AC1L2NGV, Red mercury (|A form only), 10015_RIEDEL, 203785_ALDRICH, 449180_ALDRICH, AC1Q4P31, 83379_FLUKA, CHEBI:49659, CTK9A4654, MolPort-003-925-731, 10015_SIAL, 83379_SIAL, 221090_SIAL, AKOS015902935, DB04445, IN001470, LS-89814, LT03328867, X5988, I14-19716
Mercury iodide, UNII-R03O05RB0P, CID24485, HGI, 15385-57-6