On electrolysing dilute sulphuric acid the hydrogen ions are reduced to hydrogen gas at negatively charged electrode
The ion-electron equation shows that two moles of electrons are needed to liberate one mole of the element Since 96,500 C is the charge associated with one mole of electrons, then 2 x 96,500 C will, in theory, be required to produce one mole of hydrogen.
The aim of the experiment is to confirm this i.e. to determine the quantity of electricity required to produce one mole of hydrogen by electrolysing dilute sulphuric acid.
Quantitative Electrolysis – Pupil
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