Hydrogen telluride Information & Hydrogen telluride Links at HealthHaven.com

Hydrogen telluride
IUPAC name	hydrogen telluride
Other names	hydrotelluric acid; tellane; tellurium hydride
Identifiers
CAS number	7783-09-7
PubChem	21765
Properties
Molecular formula	H2Te
Molar mass	129.6158 g mol−1
Appearance	colourless gas
Density	3.310 g/cm3, gas; 2.57 g/cm3 (-20 °C, liquid)
Melting point	−49 °C
Boiling point	−2.2 °C (unstable above -2 °C)
Solubility in water	0.70 g/100 mL
Acidity (pKa)	2.6
Structure
Molecular shape	bent
Thermochemistry
Std enthalpy of; formation ΔfHo298	0.7684 kJ/g
Hazards
Main hazards	toxic
Related compounds
Other anions	H2O; H2S; H2Se; H2Po
Other cations	Na2Te; Ag2Te
	Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
	Infobox references

Hydrogen telluride is the inorganic compound with the formula H₂Te. The simplest hydride of tellurium, it is rarely encountered because of its tendency to decompose to the constituent elements. Most compounds with Te-H bonds are unstable with respect to loss of H₂. H₂Te is chemically and structurally similar to hydrogen selenide, both are acidic species with H-X-H angles approaching 90°.^[2]

[edit] Synthesis

H₂Te is prepared by the acidification of salts of Te²⁻, such as Al₂Te₃ and Na₂Te. Na₂Te can be generated by the reaction of Na and Te in anhydrous ammonia. The intermediate in the acidification, HTe⁻ is a stable anion.

[edit] Properties

H₂Te is an endothermic compound, and is unstable in air, rapidly decomposing into water and elemental tellurium:^[3]

2 H₂Te + O₂ → 2 H₂O + 2 Te

It is almost as acidic as phosphoric acid (pKa=8.1×10⁻³), having a pKa value of about 2.3×10⁻³.^[3] It reacts with many metals to form tellurides.^[4]

[edit] See also

Dimethyltelluride

[edit] References

^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0070494398
^ Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
^ ^a ^b Egon Wiberg; Arnold Frederick Holleman (2001). Nils Wiberg. ed. Inorganic chemistry. Academic Press. p. 589. ISBN 0123526515.
^ Henry Enfield Roscoe; Carl Schorlemmer (1878). A treatise on chemistry. 1. Appleton. pp. 367–368.

[0] Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0070494398

[1] Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.

[wiberg2001-2] Egon Wiberg; Arnold Frederick Holleman (2001). Nils Wiberg. ed. Inorganic chemistry. Academic Press. p. 589. ISBN 0123526515.

[3] Henry Enfield Roscoe; Carl Schorlemmer (1878). A treatise on chemistry. 1. Appleton. pp. 367–368.

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Contents

[edit] Synthesis

[edit] Properties

[edit] See also

[edit] References