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Iron(II) iodide is a hygroscopic red-violet to black solid that is soluble in water, ethanol and diethyl ether.Rapid oxidation occurs in solution and in moist air. [5] It turns whitish when exposed to air.
As such, the iron cations are octahedral and fluoride anions are trigonal planar. [6] [7] The tetrahydrate can exist in two structures, or polymorphs. One form is rhombohedral and the other is hexagonal, the former having a disorder. [1] Like most fluoride compounds, the anhydrous and hydrated forms of iron(II) fluoride feature high spin metal ...
Iron(II) ions are easily substituted by iron(III) ions produced by its progressive oxidation. It is also easily formed as a by-product of other reactions, a.o., in the synthesis of siderite , an iron carbonate (FeCO 3 ), if the crystal growth conditions are imperfectly controlled.
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.
In chemistry, ion association is a chemical reaction whereby ions of opposite electric charge come together in solution to form a distinct chemical entity. [1] [2] Ion associates are classified, according to the number of ions that associate with each other, as ion pairs, ion triplets, etc. Ion pairs are also classified according to the nature of the interaction as contact, solvent-shared or ...
In inorganic chemistry, Fajans' rules, formulated by Kazimierz Fajans in 1923, [1] [2] [3] are used to predict whether a chemical bond will be covalent or ionic, and depend on the charge on the cation and the relative sizes of the cation and anion. They can be summarized in the following table:
Mixed-anion compounds, heteroanionic materials or mixed-anion materials are chemical compounds containing cations and more than one kind of anion. The compounds contain a single phase, rather than just a mixture.
Iron(III) iodide is prone to light-induced decomposition to iron(II) iodide and iodine. [2] [3] [4]FeI 3 + hν → FeI 2 + ½I 2. Donor solvents such as tetrahydrofuran, acetonitrile, pyridine and water also promote this reaction: iron(III) iodide is extremely hygroscopic.