enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Selenous acid - Wikipedia

    en.wikipedia.org/wiki/Selenous_acid

    As a crystalline solid, the compound can be seen as pyramidal molecules that are interconnected with hydrogen bonds. In solution it is a diprotic acid: [3] H 2 SeO 3 ⇌ H + + HSeO − 3 (pK a = 2.62) HSeO − 3 ⇌ H + + SeO 2− 3 (pK a = 8.32) It is moderately oxidizing in nature, but kinetically slow. In 1 M H +: H 2 SeO 3 + 4 H + + 4 e − ...

  3. Sodium selenide - Wikipedia

    en.wikipedia.org/wiki/Sodium_selenide

    This colourless solid is prepared by the reaction of selenium with a solution of sodium in liquid ammonia at −40 °C. [3] Alternatively, sodium selenide can be prepared by the reaction of gaseous hydrogen selenide with metallic sodium at 100 °C.

  4. Selenide - Wikipedia

    en.wikipedia.org/wiki/Selenide

    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 ...

  5. Sodium hydroselenide - Wikipedia

    en.wikipedia.org/wiki/Sodium_hydroselenide

    Sodium hydroselenide is an inorganic compound with the chemical formula Na Se H. It is a salt of hydrogen selenide. It consist of sodium cations Na + and hydroselenide anions − SeH. Each unit consists of one sodium, one selenium, and one hydrogen atom. Sodium hydroselenide is a selenium analog of sodium hydroxide NaOH.

  6. Hydrogen selenide - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_selenide

    Hydrogen selenide is hazardous, being the most toxic selenium compound [3] and far more toxic than its congener hydrogen sulfide. The threshold limit value is 0.05 ppm. The gas acts as an irritant at concentrations higher than 0.3 ppm, which is the main warning sign of exposure; below 1 ppm, this is "insufficient to prevent exposure", while at ...

  7. Selenium compounds - Wikipedia

    en.wikipedia.org/wiki/Selenium_compounds

    In solution it ionizes to HSe −. The selenide dianion Se 2− forms a variety of compounds, including the minerals from which selenium is obtained commercially. Illustrative selenides include mercury selenide (HgSe), lead selenide (PbSe), zinc selenide (ZnSe), and copper indium gallium diselenide (Cu(Ga,In)Se 2). These materials are ...

  8. Organoselenium chemistry - Wikipedia

    en.wikipedia.org/wiki/Organoselenium_chemistry

    In presence of a β-hydrogen, a selenide will give an elimination reaction after oxidation, to leave behind an alkene and a SeO-selenoperoxol. The SeO-selenoperoxol is highly reactive and is not isolated as such. In the elimination reaction, all five participating reaction centers are coplanar and, therefore, the reaction stereochemistry is syn.

  9. Sodium hydrogen selenite - Wikipedia

    en.wikipedia.org/wiki/Sodium_hydrogen_selenite

    Sodium hydrogen selenite is an inorganic chemical consisting of a ratio of one hydrogen, one sodium, three oxygen, and one selenium atom. It is the sodium salt of the conjugate base of selenous acid. This compound finds therapeutic application for providing the essential trace element selenium. Its preparation involves reacting sodium hydroxide ...