No.

pH interval

Gran type functions

System I

System II

a

pH > pK2 + D

b

pK2 − D < pH ≈ pK2

c

pK1 − D £ pH £ pK1 + D

d

pH < pK1 − D

Sequence of operations

d → c and b

d → c and b, a

Relationships

Vd = Veq1 + Veq2

Vc = Veq2/2

Vb = Veq1

Vd = Veq2 + Veq3

Vc = Vb = Veq2/2 + Veq3

Va = Veq3