21, Scandium (Sc)
lat. scandia = Skandinavien |
Säure-Base-Verhalten:
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Säure/Base-Verhalten der Scandium-Oxide: |
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Reaktionen mit: |
HF
100% |
H2SO4
conc. |
HCl
20% |
CH3COOH
25% |
H2O |
NH3
25% |
NaOH 10%
kalt |
NaOH 50%
heiß |
NaOH liq.
400°C |
| Sc2O3 |
ScF3↓ |
Sc2(SO4)3 |
ScCl3 |
(CH3COO)3Sc |
Sc(OH)3↓ |
Sc(OH)3↓ |
Sc(OH)3↓ |
NaSc(OH)4 |
Na3Sc(OH)6 |
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| Legende: |
Lösung |
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Unlöslich |
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sauer → neutral → alkalisch |
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pKS-Werte von Säure-Base-Paaren (HA + H2O ↔ H3O+ + A-) : |
| Säurename |
Formel |
 pKS-Wert |
Basenname |
Formel |
pKB-Wert |
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| Scandium-Ion |
Sc3+ |
4.93 |
Hydroxo-Scandium-Ion |
Sc(OH)2+ |
9.07 |
| Hydroxo-Scandium-Ion |
Sc(OH)2+ |
5.5 |
Dihydroxo-Scandium-Ion |
Sc(OH)2+ |
8.5 |
| Dihydroxo-Scandium-Ion |
Sc(OH)2+ |
6.4 |
Scandiumhydroxid |
Sc(OH)3 |
7.6 |
| Scandiumhydroxid |
Sc(OH)3 |
9.6 |
Tetrahydroxo-Scandat-Ion |
Sc(OH)4- |
4.4 |
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