Question

What causes the formation of bubbles at the two electrodes in electrolysis of water??​

Answer 1

Answer:

In electrolytic cells, the bubbles formed on the surface of electrodes reduce their effective surface area, causing a fluctuation in current density and the rate of reaction. ... In the systems with aqueous solution, either hydrogen or oxygen liberations are the major cause of bubble formation.

Answer 2

Answer:

Hii,

Explanation:

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When the current is applied to the electrolysis unit, the electrons on the cathode end will combine with the water, causing each water molecule to release one hydrogen atom. These hydrogen atoms are combined to form hydrogen bubbles and leaving negatively charged ions of hydroxyl group (OH-) behind (2).

$\sf\bold{\underline{Extra \: Note:-}}$

Cause of bubbles appear in anode during electrolysis :-

$\rightarrow$ Due to the presence of hydrogen and oxygen bubbles in the electrolyte during water electrolysis, the potential drop between the cathode and the anode in the two phase mixture electrolyte-gas bubbles will be increased.

Gases appear or form in cathode and anode during electrolysis :-

$\rightarrow$ CATHODE :- HYDROGEN GAS.

$\rightarrow$ ANODE :- OXYGEN.

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