B (anions)b

k A , B p o t

B (cations)b

k A , B p o t

Cl

2 × 10−4

Na+

1 × 10−4

Br

1 × 10−4

K+

2 × 10−4

NO− 3

1 × 10−4

Ag+

2 × 10−4

SO2− 4

2 × 10−5

Cu2+

3 × 10−5

H2PO− 4

1 × 10−5

Ca2+

3 × 10−5