TABLE OF CONJUGATE ACID-BASE PAIRS
Acid
Base
Ka (25 oC)
HClO4
H2SO4
HCl
HNO3
H3O+
H2CrO4
H2C2O4 (oxalic acid)
[H2SO3] = SO2(aq) + H2O
HSO4–
H3PO4
Fe(H2O)63+
H2C8H4O4 (o–phthalic acid)
H2C4H4O6 (tartaric acid)
Hg(H2O)62+
Sn(H2O)32+
HCO2H (formic acid)
Cr(H2O)63+
Hg2(H2O)22+
C6H5CO2H (benzoic acid)
HC2O4– (hydrogen oxalate)
HC4H4O6– (hydrogen tartrate)
CH3CO2H (acetic acid)
Al(H2O)63+
Be(H2O)42+
HC8H4O4– (hydrogen phthalate)
Cd(H2O)62+
Cu(H2O)62+
H2CO3
HCrO4–
H2S
H2PO4–
HSO3–
HOCl
Pb(H2O)32+
HOBr
H3BO3 or B(OH)3
NH4+
Zn(H2O)42+
Ni(H2O)62+
HCO3–
Co(H2O)62+
HOI
Fe(H2O)62+
Mn(H2O)62+
Mg(H2O)62+
Ag(H2O)2+
HPO42–
Al(H2O)3(OH)3(s)
Ca(H2O)62+
Zn(H2O)4(OH)2(s)
H2O
HS–
ClO4–
HSO4–
Cl–
NO3–
H2O
HCrO4–
HC2O4–
HSO3–
SO42–
H2PO4–
Fe(H2O)5OH2+
HC8H4O4–
HC4H4O6–
Hg(H2O)5OH+
Sn(H2O)2OH+
HCO2–
Cr(H2O)5OH2+
Hg2(H2O)OH+
C6H5CO2–
C2O42–
C4H4O62–
CH3CO2–
Al(H2O)5OH2+
Be(H2O)3OH+
C8H4O42–
Cd(H2O)5OH+
Cu(H2O)5OH+
HCO3–
CrO42–
HS–
HPO42–
SO32–
OCl–
Pb(H2O)2OH+
OBr–
B(OH)4–
NH3
Zn(H2O)3OH+
Ni(H2O)5OH+
CO32–
Co(H2O)5OH+
OI–
Fe(H2O)5OH+
Mn(H2O)5OH+
Mg(H2O)5OH+
Ag(H2O)OH(s)
PO43–
Al(H2O)2(OH)4–
Ca(H2O)5OH+
Zn(H2O)3(OH)3–
OH–
S2–
1.8 x 10–1
5.90 x 10–2
1.71 x 10–2
1.20 x 10–2
7.52 x 10–3
1.84 x 10–3
1.30 x 10–3
1.04 x 10–3
2.6 x 10–4
~2 x 10–4
1.9 x 10–4
1.6 x 10–4
~1 x 10–4
6.46 x 10–5
6.40 x 10–5
4.55 x 10–5
1.76 x 10–5
1.4 x 10–5
~1 x 10–5
3.1 x 10–6
8.32 x 10–7
~5 x 10–7
4.3 x 10–7
3.20 x 10–7
1.2 x 10–7
6.23 x 10–8
6.0 x 10–8
2.8 x 10–8
1.3 x 10–8
2.06 x 10–9
5.8 x 10–10
5.65 x 10–10
2.5 x 10–10
~6 x 10–11
5.61 x 10–11
~4 x 10–11
2.3 x 10–11
~1 x 10–11
~6 x 10–12
~4 x 10–12
~7 x 10–13
4.5 x 10–13
~4 x 10–13
3.2 x 10–13
(?)
(1.0 x 10–14)
~1 x 10–19