Question

what happens when electric current is passed through acidulated water?give reactions at two electrodes mention the product at cathode and anode.

Answer 1

When electric current is passed through acidulated water using inert electrodes, water will be decomposed into oxygen and hydrogen.

Positive ions (H+) with move to the cathode while Negative ions (OH-) will move to the anode 
At cathode: Hydrogen gas will formAt anode: Oxygen gas will form

At the cathode (negative electrode) H+ will gain electrons and form hydrogen gas;2H+(aq) + 2e– ---> H2(g) 


At the anode (positive electrode)OH- will lose electrons and form oxygen gas;4OH–(aq) ---> 2H2O(l) + O2(g) + 4e–
The overall equation for the electrolysis of acidulated water is: 

2H2O(l) ---> 2H2(g) + O2(g)

Answer 2

When electric current is passed through acidified water, it decomposes to give Hydrogen gas at cathode  and oxygen gas at anode 
The reaction is given below :

2H2O(l)---> 2H2 (g)+O2(g)

At cathode :

when current is passed from battery, the positive ions move towards cathode. They gain electrons and get neutralized to form H2 gas

2H+(aq) +2e---------> H2 (g)

AT Anode:


4OH-(aq) ----------> O2(g) +2H2O(l) + 4 e