the Selenic acid , Hydrogen selenide or hyposelenious hydride develops like the remainder of the elements of team 16, a hydride that the covalent type, which in general have molecule structure.

They are nonconductive volatile compounds v low melting and boiling points, other than in cases where hydrogen bonds deserve to be formed, which is no the case with this particular compound.




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Fig. 1. Comparison of the boiling point out of the various covalent hydrides.

it is also part of the so-called"hydrogen calcogenides", binary compounds the arise from the union the hydrogen with a calcogen atom, which room the aspects that type part of group 16 the the regular table such together oxygen, sulfur, selenium and also tellurium .

Hydrogen selenide, selenium hydride or selenide acid is a colorless, flammable gas under standard problems (0 ° C = 273,15 K and also 1 amt = 1.01325.10 5 Pa), yet with a characteristic odor of a rotten egg, together is additionally the situation with compounds having sulfur, i m sorry is additionally found in the same team as the periodic table.

the is the most toxic of selenium compounds, restricting their use or exposure border to 0.05 ppm / 8 hours. Even when it is in an extremely low concentrations, the smell have the right to become really unpleasant.

Formula

the formula is H2Se, exhilaration selenium through valence -2, and hydrogen with valence +1.

framework

The structure embraced by the H 2 the is about angular in space, the angle developing the H-Se-H shortcut of 91 °, and the distance between the Se-H is 146 pm.

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properties

Hydrogen selenide is significantly an ext acidic 보다 hydrogen sulfide (Holleman & Wiberg, 2001). The dissociation the the first proton is in the order of other compounds such as nitrous mountain (HNO2) who Ka = 4.5.10 -4 and of hydrogen fluoride who Ka = 7.2.10 -4 . Adhering to reaction through its determined acidity constant:

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The second ionization continuous of the hydride is the the stimulate of 10 -eleven .

together diprotic acid, it develops both hydrogen selenides of the formula M¹HSe , and also the common seleniuros (or neutral seleniuros) M½Se. Prefer sulfur homologs, selenium metals are an ext or less colored, insoluble in water, and sometimes insoluble also in acids, and can it is in synthesized by the reaction of a selenium hydrogen through a systems of steel salt.

H2Se is a weaker base than H2S, and also can be protonated in fluid hydrofluoric acid in the presence of SbF 5 (But is no AsF presence 5 ), at -78 ° C.

as result of its short stability, hydrogen selenide is a potent reducing agent, even more so than hydrogen sulfide.

H"s accusative services 2 They space oxidized promptly by atmospheric oxygen, giving a properties red precipitate. Because of this sensitivity come oxygen, when you want to synthesize H 2 the must, in the absence of O 2 .

Therefore, it deserve to be claimed that H2Se has similar properties come H2S, with the distinction that the previous is an ext acidic than the latter, and also its solubility in water is a reflection of this.

contact with oxidants, acids, water, and also halogenated hydrocarbons may cause explosions (Centers for condition Control and Prevention, 1978). Together for the risk linked with the decomposition of the products, it have the right to emit toxic gases and steam, such as selenium dioxide smoke, which have the right to be released in the type of a fire in which there is hydrogen selenide.

Data that its properties

molecular mass = 80.98 g / mol. Colorless gas. PKa 1 = 3.89; PKa 2 = 11.0 in ~ 25 ° C. Melting and also boiling point out = - 65.73 ºC and - 41.25 ºC respectively. Solubility in water = 0.70 g / 100 mL. additionally soluble in compound such as CS 2 , and phosgene.

synthetic

To produce hydrogen selenide or hydrogen selenide top top an commercial scale, that is carried out by treating elemental selenium in ~ temperatures over 300 ° C with hydrogen in gas form.

Although the is possible to speak that many fabricated routes because that the production of selenic acid, both long and small scale, the H 2 the is typically prepared in the activities by Al activity 2 he 3 through water, i m sorry occurs simultaneously with the development of sign language alumina, as viewed in the following reaction

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The aluminum selenide essential for this reaction deserve to be prepared by direct synthesis as shown in the complying with chemical equation (PrepChem.com, 2016):

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being the selenium, a toxic element, that would have to work v him under the hood.

Hydrogen selenide may likewise be prepared in situ, in aqueous systems (Tlv, 2001), making use of boron hydride.

Applications

Hydrogen selenide is offered to prepare (New Jersey room of wellness and senior Services, 1999), steel selenides and organoselenized compounds. The is likewise used for doping gas mixtures because that the preparation of semiconductor products containing controlled quantities of significant impurities.

referrals Centers for disease Control and Prevention. (1978). Occupational wellness guideline because that hydrogen selenide. Cohen, V. I. (1980). A practically Synthesis of Mono-, N , N "-Di-, and also Trisubstituted Selenoureas indigenous Methyl Carbamimidothioates ( S -Methylpseudothioureas). synthetic , 1980 (1), 60-63. Holleman, A. F., & Wiberg, E. (2001). Not natural chemistry. In inorganic chemistry (Page 578). Mountain Diego, California. brand-new Jersey department of health and senior Services. (1999). Hydrogen Selenide. Hazardous Substance truth Sheet . PrepChem.com. (2016). Synthetic of HYDROGEN SELENIDE. Re-cover January 10, 2017, indigenous prepchem.com. PubChem. (2016). Dihydrogen selenide | H2Se. Re-cover January 9, 2017, native pubchem.ncbi.nlm.nih.gov. Tlv, S. (2001). Hydrogen Selenide. NIOSH Pocket guide to Chemical dangers # 0336 . (N.d.). National Institute for work Safety and also Health (NIOSH). Retrieved indigenous cdc.gov. Hydrogen selenide. (N.d.). automatically Dangerous come Life and also Health . Retrieved indigenous cdc.gov. Hydrogen Selenide - H2Se. (N.d.).

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Recall January 9, 2017, from c-f-c.com.