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Manganese(II) iodide is the chemical compound composed of manganese and iodide with the formula MnI 2 (H2O) n. The tetrahydrate is a pink solid while the anhydrous derivative is beige. [2] Both forms feature octahedral Mn centers. Unlike MnCl 2 (H 2 O) 4 and MnBr 2 (H 2 O) 4 which are cis, MnI 2 (H 2 O) 4 is trans. [3]
It may refer more specifically to the following manganese minerals: Birnessite, (Na,Ca) 0.5 (Mn IV,Mn III) 2 O 4 · 1.5 H 2 O; Buserite, MnO 2 ·nH 2 O; Hausmannite, Mn II Mn III 2 O 4; Manganite, Mn III O(OH) Manganosite, Mn II O; Psilomelane, Ba(Mn II)(Mn IV) 8 O 16 (OH) 4, or (Ba,H 2 O) 2 Mn 5 O 10; Pyrolusite, Mn IV O 2; Manganese may also ...
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.
Manganese(IV) oxide (manganese dioxide, MnO 2) is used as a reagent in organic chemistry for the oxidation of benzylic alcohols (where the hydroxyl group is adjacent to an aromatic ring). Manganese dioxide has been used since antiquity to oxidize and neutralize the greenish tinge in glass from trace amounts of iron contamination. [ 45 ]
These methods work best when the iodide product is stable to hydrolysis; otherwise, the possibilities include high-temperature oxidative iodination of the element with iodine or hydrogen iodide, high-temperature iodination of a metal oxide or other halide by iodine, a volatile metal halide, carbon tetraiodide, or an organic iodide. For example ...
Manganese dioxide is the inorganic compound with the formula MnO 2 . This blackish or brown solid occurs naturally as the mineral pyrolusite , which is the main ore of manganese and a component of manganese nodules .
The acid facilitates the conversion by the brown, Manganese-containing precipitate of the Iodide ion into elemental Iodine. The Mn(SO 4) 2 formed by the acid converts the iodide ions into iodine, itself being reduced back to manganese(II) ions in an acidic medium. Mn(SO 4) 2 + 2 I − (aq) → Mn 2+ (aq) + I 2 (aq) + 2 SO 2− 4 (aq)
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