20, Calcium (Ca)
lat. calx = Kalk |
Säure-Base-Verhalten:
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Säure/Base-Verhalten der Calcium-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 |
| CaO |
CaF2↓ |
CaSO4↓ |
CaCl2 |
(CH3COO)2Ca |
Ca(OH)2↓ |
Ca(OH)2↓ |
Ca(OH)2↓ |
Ca(OH)2↓ |
Ca(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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| Calcium-Ion |
Ca2+ |
11.57 |
Hydroxo-Calcium-Ion |
Ca(OH)+ |
2.43 |
| Hydroxo-Calcium-Ion |
Ca(OH)+ |
12.63 |
Calciumhydroxid |
Ca(OH)2 |
1.37 |
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