Question

Why is hydrogen produced at cathode in electrolysis of aquesous calcium bromide solution

Answer 1

Since water can be both oxidized and reduced, it competes with the dissolved Na+ and Cl– ions. ... At the cathode (C), water is reduced to hydroxide and hydrogen gas. The net process is the electrolysis of an aqueous solution of NaCl into industrially useful products sodium hydroxide (NaOH) and chlorine gas.