Acid
HSbF6
Relative Strength of Some Brønsted-Lowry Acids
Conjugate
pKa
pKa
Acid
Conjugate Base
Base
O
O
F
F
F
C
F
C
SbF6–
–12
0.52
C
OH
C
O
F
HI
–10
I–
H2SO4
–10
HSO4–
F
HF
O
3.2
C
4.75
H3 C
H
HBr
HCl
–9
Br–
–7
Cl–
O
S OH
O
S O
O
–6.5
+
O
–3.8
H3 C
–2.5
H
CH3
H
+
H
O
CH3
H
+
H
O
–1.74
H
O
O
H
C
CH3
–1.4
C
9.0
9.2
H3 C
C
C
C
CH3
O
O
NH3
O
9.9
+
H3 C NH3
10.6
O
15.7
H
H
H3C
NO3
O
H
CH3
O
H
H
16
H3C NH2
–
H3 C
C
O
H
H3C
O
HNO3
C
OH
CH3
O
H3 C
H
C
O
O
+
NH4
O
H
H3 C
H3 C
OH
F–
O
O
O
CH2 H
19.2
H3 C
C
CH2
H C C H
25
H2
NH3
35
38
H C C
H–
NH2–
H2C CH2
44
H2C CH
H3C CH3
50
H3C CH2