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Paragraph 4 APPARATUS

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4.1

Potentiometer with silver indicating electrode and calomel reference electrode, sensitivity 2 mV, covering the range −500 to +500 mV, or with silver and mercury (1) sulfate electrodes.

4.2

Bridge, containing a saturated potassium nitrate solution, connected to the calomel electrode (4.1), fitted at the ends with porous plugs. This bridge is not necessary if silver and mercury (1) sulfate electrodes are used.

4.3

Magnetic stirrer, with a Teflon-coated rod.

4.4

Microburette with fine-pointed tip, graduated in 0.01 ml divisions.