Hydrogen telluride

Hydrogen telluride, also known as hydrotelluric acid, tellane, or tellurium hydride, is a chemical compound. It is also an acid. Its chemical formula is H₂Te. It contains hydrogen and telluride ions.

Hydrogen telluride

Structural diagram of the hydrogen telluride molecule Space-filling model of the hydrogen telluride molecule
Names
IUPAC name hydrogen telluride
Other names hydrotelluric acid tellane tellurium hydride
Identifiers
CAS Number	7783-09-7 Y
ECHA InfoCard	100.029.073
PubChem CID	21765
CompTox Dashboard (EPA)	DTXSID20228446
Properties
Chemical 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 (224 K) ( [1]
Boiling point	−2.2 °C (271.8 K)(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	{{{value}}}
Other cations	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Properties

Hydrogen telluride is a toxic reactive gas. It easily decomposes to hydrogen and tellurium. It also burns in air to make tellurium dioxide and water. It has a very bad smell of decayed garlic. It is almost as acidic as phosphoric acid. It reacts with some metals and metal oxides to make tellurides.

Preparation

It is made by adding a strong acid to a telluride, such as sodium telluride.

Uses

Hydrogen telluride does not have many uses because it is very toxic and unstable.

Related pages

• Aluminium telluride
• Sodium tellurite