Chemistry
During the electrolysis of acidulated water using platinum electrodes:
(a) State the volume ratio of the products formed at electrodes.
(b) Is it an example of catalysis?
(c) Write the reaction occurring at the anode
Electrolysis
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Answer
(a) Hydrogen and oxygen are obtained in the volume ratio 2 : 1 (H2 : O2).
(b) Water in pure state consists almost entirely of molecules. It is a polar covalent compound and can form ions when traces of dilute sulphuric acid is added. As dilute sulphuric acid catalyses this ionisation, hence this electrolysis of acidified water is considered as an example of catalysis.
(c) Reaction at anode:
4OH- - 4e- ⟶ 4OH
4OH ⟶ 2H2O + O2
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