52, Tellur (Te)

lat. tellus = Erde

Säure-Base-Verhalten:

         
  As Se Br  
  Sb Te I  
  Bi Po At  
         
   
 
   
   
   
   
   

Säure/Base-Verhalten der Tellur-Oxide:

  Reaktionen mit:
HF
100%
H2SO4
conc.
HCl
20%
CH3COOH
25%
H2O NH3
25%
NaOH 10%
kalt
NaOH 50%
heiß
NaOH liq.
400°C
TeO2 TeO2 TeO2 TeCl4 H2TeO3 H2TeO3 (NH4HTeO3 Na2TeO3 Na2TeO3 Na2TeO3
TeO3 H6TeO6 H6TeO6 H6TeO6 H6TeO6 H6TeO6 NH4H5TeO6 NaH5TeO6 Na2H4TeO6 Na6TeO6
 
Legende: Lösung   Unlöslich   sauer →  neutral  → alkalisch  
 
 

pKS-Werte von Säure-Base-Paaren (HA + H2O ↔ H3O+ + A-) :

Säurename Formel pKS-Wert Basenname Formel pKB-Wert

Tellurwasserstoffsäure H2Te 2.64 Hydrogentellurid-Ion HTe- 11.36
Hydrogentellurid-Ion HTe- 10.69 Tellurid-Ion Te2- 3.31

Tellurige Säure H2TeO3 2.7 Hydrogentellurid-Ion HTeO3- 11.3
Hydrogentellurid-Ion HTeO3- 8 Tellurit-Ion SeO32- 6

Orthotellursäure H6TeO6 7.7 Pentahydrogenorthotellurat-Ion H5TeO6- 6.3
Pentahydrogenorthotellurat-Ion H5TeO6- 10.95 Tetrahydrogenorthotellurat-Ion H4TeO62- 3.05
Tetrahydrogenorthotellurat-Ion H4TeO62- 14.25 Trihydrogenorthotellurat-Ion H3TeO63- -0.25