Question

Construction and working of electrode and rotating platinum electrode

Answer 1

Answer:

"An electrode is made of a thin rectangular platinum foil that is coated with fresh platinum black to increase the adsorption capacity of the metal. It is welded and the end of it is fused into an inner tube through its base.

In the inner tube, a small amount of mercury is taken and a Cu wire is inserted to create the external electrical contact. The inner tube is enclosed in an outer jacket that has an inlet tube for sending in hydrogen gas.

It has a perforated wider base for the escape of excess hydrogen. The unit is dipped in HCl in a beaker so that the metal foil dips in the solution. A rotating platinum electrode is made of a platinum wire that is sealed at the bottom of the electrode. It then extends to the outer edge of the bell.

To ensure contact, the platinum wire is held with household cement to the side of the bell, leaving the portion in contact with the mercury uncovered. The glass bell should not exceed a depth of more than 3 mm into the mercury. The mercury bath has to be filled to a height of 6 to 10 mm.

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Explanation: