Describe the bulk preparation of hydrogen by electrolytic method

Asked by admin @ 20/08/2021 in Chemistry viewed by 261 People

Question 9.5 Describe the bulk preparation of dihydrogen by electrolytic method. What is the role of an electrolyte in this process?

Class XI Hydrogen Page 288

Answered by admin @ 20/08/2021

Electrolysis of water :- it is the best method for manufacturing of dihydrogen where electricity is cheap.see the attachment ,
In this cell,iron sheet is used as a cathode while nickel plated iron sheets act as anode.

Two electrodes are separated from each other by an asbestos diahragm which prevent mixing of dihydrogen and dioxygen.
On passing electric current, dihydrogen gas is collected at cathode while dioxygen at anode.

the decomposition of water takes place as follow :
H2O <=> H+ + OH-
at cathode , H+ + e -->H•
H• + H• --> H2

at anode, OH- --> 4OH + 4e-
4OH ----> 2H2O + O2

The role of an electrolyte is to make water conducting.

Describe the bulk preparation of hydrogen by electrolytic method

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