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Mercury(II) iodide crystals grown in Spacelab. Mercury(II) iodide is used for preparation of Nessler's reagent, used for detection of presence of ammonia.. Mercury(II) iodide is a semiconductor material, used in some x-ray and gamma ray detection and imaging devices operating at room temperatures.
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
Substance Formula 0 °C 10 °C 20 °C 30 °C 40 °C 50 °C 60 °C 70 °C 80 °C 90 °C 100 °C Barium acetate: Ba(C 2 H 3 O 2) 2: 58.8: 62: 72: 75: 78.5: 77: 75
In common with other Hg(I) (mercurous) compounds which contain linear X-Hg-Hg-X units, Hg 2 I 2 contains linear IHg 2 I units with an Hg-Hg bond length of 272 pm (Hg-Hg in the metal is 300 pm) and an Hg-I bond length of 268 pm. [2] The overall coordination of each Hg atom is octahedral as it has in addition to the two nearest neighbours there are four other I atoms at 351 pm. [2] The compound ...
, which forms an insoluble Hg(II) salt, induces complete disproportionation, whereas Cl − , which forms an insoluble Hg(I) salt, induces the reverse. [ 3 ] Most salts with main group elements tend to contain only Hg(II) and metallic mercury, because the presence of strong Lewis bases destabilizes the intermetallic bond.
Very soluble <1 calcium nitrate: 158.7 0.63 Freely soluble 1 to 10 calcium chloride: 65 1.54 Soluble 10 to 30 sodium oxalate: 3.9 26 Sparingly soluble 30 to 100 Slightly soluble 100 to 1000 calcium sulfate: 0.21 490 Very slightly soluble 1000 to 10,000 dicalcium phosphate: 0.02 5000 Practically insoluble or insoluble ≥ 10,000 barium sulfate ...
It is a brown/black powder, insoluble in water but soluble in nitric acid. With hydrochloric acid, it reacts to form calomel, Hg 2 Cl 2. [4] Mercury(I) oxide is toxic but without taste or smell. It is chemically unstable and converts to mercury(II) oxide and mercury metal.
Sodium iodide is soluble in acetone and sodium chloride and sodium bromide are not. [29] The reaction is driven toward products by mass action due to the precipitation of the insoluble salt. [30] [31]