91, Protactinium (Pa)
gr. protos = vorher, vor dem Actinium |
Säure-Base-Verhalten:
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Säure/Base-Verhalten der Protactinium-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 |
Pa2O5 |
PaOF3 |
(PaO)2(SO4)3 |
PaOCl3 |
PaO(CH3COO)3 |
PaO(OH)3↓ |
PaO(OH)3↓ |
PaO(OH)3↓ |
PaO(OH)3↓ |
PaO(OH)3↓ |
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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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Protactinium(IV)-Ion |
Pa4+ |
-0.80 |
Hydroxo-Protactinium(IV)-Ion |
Pa(OH)3+ |
14.8 |
Hydroxo-Protactinium(IV)-Ion |
Pa(OH)3+ |
0.14 |
Dihydroxo-Protactinium(IV)-Ion |
Pa(OH)22+ |
13.86 |
Dihydroxo-Protactinium(IV)-Ion |
Pa(OH)22+ |
0.38 |
Trihydroxo-Protactinium(IV)-Ion |
Pa(OH)3+ |
13.62 |
Trihydroxo-Protactinium(IV)-Ion |
Pa(OH)3+ |
1.25 |
Protactinium(IV)hydroxid |
Pa(OH)4 |
12.75 |
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Protactinyl(V)-Ion |
PaO3+ |
0.65 |
Hydroxo-Protactinyl(V)-Ion |
PaO(OH)2+ |
13.35 |
Hydroxo-Protactinyl(V)-Ion |
PaO(OH)2+ |
3.46 |
Dihydroxo-Protactinyl(V)-Ion |
PaO(OH)2+ |
10.54 |
Dihydroxo-Protactinyl(V)-Ion |
PaO(OH)2+ |
11.19 |
Protactinyl(V)hydroxid |
PaO(OH)3 |
2.81 |
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