88, Radium (Ra)
lat. radius = Strahl |
Säure-Base-Verhalten:
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Säure/Base-Verhalten der Radium-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 |
RaO |
RaF2↓ |
RaSO4↓ |
RaCl2 |
(CH3COO)2Ra |
Ra(OH)2 |
Ra(OH)2 |
Ra(OH)2 |
Ra(OH)2 |
Ra(OH)2 |
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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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Radium-Ion |
Ra2+ |
13.40 |
Hydroxo-Radium-Ion |
Ra(OH)+ |
0.6 |
Hydroxo-Radium-Ion |
Ra(OH)+ |
14 |
Radiumhydroxid |
Ra(OH)2 |
0 |
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