3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||175.6 g/mol|
|Appearance||yellow-orange crystals (α-TeO3)|
|Density||5.07 g/cm3, solid|
|Melting point||430 °C (806 °F; 703 K)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
α-TeO3 can be prepared by heating orthotelluric acid, Te(OH)6, at over 300 °C . The β-TeO3 form can be prepared by heating α-TeO3 in a sealed tube with O2 and H2SO4.
α-TeO3 is unreactive to water but is a powerful oxidising agent when heated. With alkalis it forms tellurates.
α-TeO3 when heated loses oxygen to form firstly Te2O5 and then TeO2.