28, Nickel (Ni)
Niccolum, mhd. Nickel = Kobold, Teufel |
Säure-Base-Verhalten:
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Säure/Base-Verhalten der Nickel-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 |
NiO |
NiF2↓ |
NiSO4 |
NiCl2 |
(CH3COO)2Ni |
Ni(OH)2↓ |
Ni(NH3)42+ |
NaNi(OH)3 |
NaNi(OH)3 |
Na2Ni(OH)4 |
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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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Nickel(II)-Ion |
Ni2+ |
9.86 |
Hydroxo-Nickel(II)-Ion |
Ni(OH)+ |
4.14 |
Hydroxo-Nickel(II)-Ion |
Ni(OH)+ |
10.22 |
Nickel(II)hydroxid |
Ni(OH)2 |
3.78 |
Nickel(II)hydroxid |
Ni(OH)2 |
10.88 |
Trihydroxoniccolat(II)-Ion |
Ni(OH)3- |
3.12 |
Trihydroxoniccolat(II)-Ion |
Ni(OH)3- |
13.67 |
Tetrahydroxoniccolat(II)-Ion |
Ni(OH)42- |
0.33 |
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