Metrohm 796 Titroprocessor - Manual (Page 109)

7. Titration and measuring modes
796 Titroprocessor, Instructions for use 103 103
pH = pK + log(a
B
/a
A
)
If a
B
= a
A
, then pH = pK.
The pK value determined is the volume at the half neutralization point, which
can be obtained from the titration curve. Careful calibration of the pH elec-
trode used is a precondition for a correct determination of the pK value.
In non-aqueous solutions the half neutralization potential (
HNP) is often
used instead of the pK value. The HNP value is evaluated in the same way
as the pK value.
The various parameters for the DET modes are described in detail
on pages 128 to 142.