Instant Notes: Analytical Chemistry

C10 – Conductimetry 107

Conductimetric titrations may be carried out in nonaqueous media. For

example, phenols, which are very weak acids in water, have enhanced acidity

when liquid ammonia is used as the solvent, and may be titrated conductimetri-

cally with an ammoniacal solution of KOH.

1.4

12

1

0.8

0.6

0.4

0.2

0

0 0.5 1 1.5 2

Volume added (cm^3 )

HCl HB NH 4 Cl

4

3.5

3

2.5

2

1.5

1

0.5

0

012345

Volume added (cm^3 )

1000 x conductance

Conductance

(a) (b)

Fig. 1. (a) Conductimetric titration of mixed acids with 1.0 M NaOH. (b) Conductimetric titration of 0.1 M AgNO 3 with
1.0 M KCl.