Lecture 23 Potentiometry, Ion-Selective Electrodes. Reading: Ch....

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Lecture 23Potentiometry, Ion-Selective Electrodes.

Reading: Ch. 14

Outline

1. Potentiometry (15-1)

2. Reference Electrode (15-1)

3. How ion-selective electrodes work (15-4)

4. Glass pH-electrode (15-5)

Junction potential

+ _

How do ion-selective electrodes work?

distance

activ

ity o

r co

ncen

trat

ion

[ ]pb,Na

potHNapb,H

0 aaln ++ ++= KF

RTEEPB

Nikolsky equation:

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