76, Osmium (Os)

gr. osme = Geruch

Säure-Base-Verhalten:

         
  Tc Ru Rh  
  Re Os Ir  
  Bh Hs Mt  
         
   
 
   
   
   
   
   

Säure/Base-Verhalten der Osmium-Oxide:

  Reaktionen mit:
HF
100%
H2SO4
conc.
HCl
20%
CH3COOH
25%
H2O NH3
25%
NaOH 10%
kalt
NaOH 50%
heiß
NaOH liq.
400°C
OsO2 OsO2 OsO2 OsO2 OsO2 OsO2 OsO2 Na2OsO3(?)
 
Legende: Lösung   Unlöslich   sauer →  neutral  → alkalisch  
 
 

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

Säurename Formel pKS-Wert Basenname Formel pKB-Wert

Perosmiumsäure H4OsO6 7.2 Trihydrogenperosmat(VIII)-Ion H3OsO6- 6.8
Trihydrogenperosmat(VIII)-Ion H3OsO6- 12.2 Dihydrogenperosmat(VIII)-Ion H2OsO62- 1.8
Dihydrogenperosmat(VIII)-Ion H2OsO62- 13.95 Hydrogenperosmat(VIII)-Ion HOsO63- 0.05
Hydrogenperosmat(VIII)-Ion HOsO63- 14.17 Perosmat(VIII)-Ion OsO64- -0.17