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Hydrogen selenide is an inorganic compound with the formula H 2 Se. This hydrogen chalcogenide is the simplest and most commonly encountered hydride of selenium. H 2 Se is a colorless, flammable gas under standard conditions. It is the most toxic selenium compound [3] with an exposure limit of 0.05 ppm over an 8-hour period.
Sample of cadmium selenide, a pigment. The parent inorganic selenide is hydrogen selenide (H 2 Se). It is a colorless, malodorous, toxic gas. It dissolves in aqueous solution, to give the hydrogenselenide or biselenide ion HSe −. At higher pH, selenide forms. Solutions of hydrogen selenide and selenide are oxidized by air to give elemental ...
A hydroselenide (or biselenide or selanide) is an ion or chemical compound containing the [SeH] − ion. The radical HSe is a pseudohalogen. Hydroselenide can be a ligand in transition metal complexes where it can be attached to a single atom, or bridge two atoms. The terms used in ligand naming are selanido, or hydrogenselenido. [1]
Analogous to the behavior of other chalcogens, selenium forms hydrogen selenide, H 2 Se. It is a strongly odiferous, toxic, and colorless gas. It is more acidic than H 2 S. In solution it ionizes to HSe −. The selenide dianion Se 2− forms a variety of
Alternatively it can be made from sodium ethoxide exposed to hydrogen selenide: [1] CH 3 CH 2 O − Na + + H 2 Se → NaSeH + CH 3 CH 2 OH. Sodium hydroselenide is not made for storage, instead it is used immediately after production in a fume hood thanks to the appalling odour of hydrogen selenide.
It is the selenium analog of the sulfite ion, SO 2− 3. Thus selenite is pyramidal and selenium is assigned oxidation state +4. Selenite also refers to compounds that contains this ion, for example sodium selenite Na 2 SeO 3 which is a common source of selenite. [1] Selenite also refers to the esters of selenous acid, for example dimethyl ...
Selenic acid is a stronger oxidizer than sulfuric acid, [9] capable of liberating chlorine from chloride ions, being reduced to selenous acid in the process: H 2 SeO 4 + 2 H + + 2 Cl − → H 2 SeO 3 + H 2 O + Cl 2. It decomposes above 200 °C, liberating oxygen gas and being reduced to selenous acid: [6] 2 H 2 SeO 4 → 2 H 2 SeO 3 + O 2
When a salt of a metal ion, with the generic formula MX n, is dissolved in water, it will dissociate into a cation and anions. [citation needed]+ + (aq) signifies that the ion is aquated, with cations having a chemical formula [M(H 2 O) p] q+ and anions whose state of aquation is generally unknown.