Polymer

Titrant

q

pKa,app(0.55)

P2VP

HBr

4.1

2.13

HCl

4.2

1.86

HNO3

4.0

2.09

HClO4

4.1

2.00

P3VP

HBr

1.9

3.03

HCl

2.1

2.92

HNO3

1.9

3.03

HClO4

1.3

3.15

P4VP

HBr

1.5

3.34

HCl

1.8

3.27

HNO3

1.5

3.36

HClO4

1.0

3.62