79, Gold (Au)
Aurum, lat. aurum = Gold |
Säure-Base-Verhalten:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Säure/Base-Verhalten der Gold-Oxide: |
|
Reaktionen mit: |
HF 100% |
H2SO4 conc. |
HCl 20% |
CH3COOH 25% |
H2O |
NH3 25% |
NaOH 10% kalt |
NaOH 50% heiß |
NaOH liq. 400°C |
Au2O3 |
AuF3 |
Au2(SO4)3 |
HAuCl4 |
|
|
|
|
|
|
|
Legende: |
Lösung |
|
Unlöslich |
|
sauer → neutral → alkalisch |
|
|
|
|
pKS-Werte von Säure-Base-Paaren (HA + H2O ↔ H3O+ + A-) : |
Säurename |
Formel |
pKS-Wert |
Basenname |
Formel |
pKB-Wert |
|
Gold(I)-Ion |
Au+ |
3.8 |
Gold(I)hydroxid |
AuOH |
10.2 |
Gold(I)hydroxid |
AuOH |
12.4 |
Dihydroxo-Aurat(I)-Ion |
Au(OH)2- |
1.6 |
|
Gold(III)-Ion |
Au3+ |
-1.50 |
Hydroxo-Gold(III)-Ion |
Au(OH)2+ |
15.5 |
Hydroxo-Gold(III)-Ion |
Au(OH)2+ |
0.5 |
Dihydroxo-Gold(III)-Ion |
Au(OH)2+ |
13.5 |
Dihydroxo-Gold(III)-Ion |
Au(OH)2+ |
1.0 |
Gold(III)hydroxid |
Au(OH)3 |
13 |
Gold(III)hydroxid |
Au(OH)3 |
11.8 |
Tetrahydroxo-Aurat(III)-Ion |
Au(OH)4- |
2.2 |
Tetrahydroxo-Aurat(III)-Ion |
Au(OH)4- |
13.3 |
Pentahydroxo-Aurat(III)-Ion |
Au(OH)52- |
0.7 |
Pentahydroxo-Aurat(III)-Ion |
Au(OH)52- |
16 |
Hexahydroxo-Aurat(III)-Ion |
Au(OH)63- |
-2 |
|