Constantes d'acidité et de basicité à 25 °C
Nom |
Couple acide - base |
Ka |
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acide perchlorique |
HClO4 |
= |
ClO4– |
10+12 |
chlorure d'hydrogène |
HCl |
= |
Cl– |
10+6 |
acide sulfurique |
H2SO4 |
= |
HSO4– |
10+3 |
|
HSO4– |
= |
SO42– |
1,3 × 10–2 |
acide nitrique |
HNO3 |
= |
NO3– |
10+2 |
acide phosphorique |
H3PO4 |
= |
H2PO4– |
7,5 × 10–3 |
|
H2PO4– |
= |
HPO42– |
6,2 × 10–8 |
|
HPO42– |
= |
PO43– |
4,8 × 10–13 |
fluorure d'hydrogène |
HF |
= |
F– |
3,5 × 10–4 |
acide chloroacétique |
ClCH2COOH |
= |
ClCH2COO– |
1,8 × 10–4 |
acide benzoïque |
C6H5COOH |
= |
C6H5COO– |
6,7 × 10–5 |
acide acétique |
CH3COOH |
= |
CH3COO– |
1,75 × 10–5 |
acide propionique |
C2H5COOH |
= |
C2H5COO– |
1,3 × 10–5 |
dioxyde de carbone |
CO2 + H2O |
= |
HCO3– |
4,5 × 10–7 |
|
HCO3– |
= |
CO32– |
4,7 × 10–11 |
acide hypochloreux |
HClO |
= |
ClO– |
4,0 × 10–8 |
cyanure d'hydrogène |
HCN |
= |
CN– |
7,2 × 10–10 |
phénol |
C6H5OH |
= |
C6H5O– |
1,3 × 10–10 |
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Nom |
Couple base - acide |
Kb |
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triéthylamine |
(C2H5)3N |
= |
(C2H5)3NH+ |
1,0 × 10–3 |
éthylamine |
C2H5NH2 |
= |
C2H5NH3+ |
6,5 × 10–4 |
diméthylamine |
(CH3)2NH |
= |
(CH3)2NH2+ |
5,4 × 10–4 |
méthylamine |
CH3NH2 |
= |
CH3NH3+ |
3,6 × 10–4 |
ammoniac |
NH3 |
= |
NH4+ |
1,75 × 10–5 |
pyridine |
C5H5N |
= |
C5H5NH+ |
1,8 × 10–9 |
aniline |
C6H5NH2 |
= |
C6H5NH3+ |
4,3 × 10–10 |
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