lecture 23 potentiometry, ion-selective electrodes....

Lecture 23 Potentiometry, Ion-Selective Electrodes. Reading: Ch. 14

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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)

Page 3: Lecture 23 Potentiometry, Ion-Selective Electrodes. …chemistry.oregonstate.edu/courses/ch421/Previous pages...Potentiometry, Ion-Selective Electrodes. Reading: Ch. 14 Outline 1

Page 4: Lecture 23 Potentiometry, Ion-Selective Electrodes. …chemistry.oregonstate.edu/courses/ch421/Previous pages...Potentiometry, Ion-Selective Electrodes. Reading: Ch. 14 Outline 1

Page 5: Lecture 23 Potentiometry, Ion-Selective Electrodes. …chemistry.oregonstate.edu/courses/ch421/Previous pages...Potentiometry, Ion-Selective Electrodes. Reading: Ch. 14 Outline 1

Page 6: Lecture 23 Potentiometry, Ion-Selective Electrodes. …chemistry.oregonstate.edu/courses/ch421/Previous pages...Potentiometry, Ion-Selective Electrodes. Reading: Ch. 14 Outline 1

Junction potential

Page 7: Lecture 23 Potentiometry, Ion-Selective Electrodes. …chemistry.oregonstate.edu/courses/ch421/Previous pages...Potentiometry, Ion-Selective Electrodes. Reading: Ch. 14 Outline 1

+ _

Page 8: Lecture 23 Potentiometry, Ion-Selective Electrodes. …chemistry.oregonstate.edu/courses/ch421/Previous pages...Potentiometry, Ion-Selective Electrodes. Reading: Ch. 14 Outline 1

How do ion-selective electrodes work?

distance

activ

ity o

r co

ncen

trat

ion

Page 9: Lecture 23 Potentiometry, Ion-Selective Electrodes. …chemistry.oregonstate.edu/courses/ch421/Previous pages...Potentiometry, Ion-Selective Electrodes. Reading: Ch. 14 Outline 1

Page 10: Lecture 23 Potentiometry, Ion-Selective Electrodes. …chemistry.oregonstate.edu/courses/ch421/Previous pages...Potentiometry, Ion-Selective Electrodes. Reading: Ch. 14 Outline 1

[ ]pb,Na

potHNapb,H

0 aaln ++ ++= KF

RTEEPB

Nikolsky equation:

Page 11: Lecture 23 Potentiometry, Ion-Selective Electrodes. …chemistry.oregonstate.edu/courses/ch421/Previous pages...Potentiometry, Ion-Selective Electrodes. Reading: Ch. 14 Outline 1

Page 12: Lecture 23 Potentiometry, Ion-Selective Electrodes. …chemistry.oregonstate.edu/courses/ch421/Previous pages...Potentiometry, Ion-Selective Electrodes. Reading: Ch. 14 Outline 1

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