Please explain this part:

Dear student,

Pure water is very stable and this is the reason that it is not easily decomposed into hydrogen and oxygen. From the extraction of hydrogen gas and oxygen from pure water it is required to make the water acidic or basic, for this reason strong acid like sulphuric acid or strong base like sodium hydroxide is added.

Sulphuric acid decomposes into hydrogen ion and sulphate ion. Sulphate ion does not take part in this reaction because it is a stable ion, it contains sulphur in its +6 oxidation state.

At cathode hydrogen gas is released by the process of reduction. Reduction is the gain of electron.
At anode oxygen gas is released by the process of oxidation. Oxidation is the loss of electron.

The net overall reaction shows the extraction of hydrogen and oxygen from acidified water with the help of electricity.



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