Electrolysis of Sodium Sulphate solution for gases
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... d of electrons. Once it has done this it gets attracted to the cathode and so hydrogen is given off. At the anode oxygen should have been given off at the anode. This is because oxygen is positively charged and so must obtain some electrons to become neutral. Once it has done this it gets attracted to the anode and so oxygen gas is given off. The reason why no oxygen or very little was given off was because that the oxygen reacted with the carbon electrodes to form carbon dioxide. This was not given off at the electrodes but left in the solution. Using half equations we can explain what happens at the electrodes: - 2H+ + 2e- = H (HYDROGEN) 4OH- - 4e- = 2H O + O (OXYGEN) Na+ + e- = Na (SODIUM) SO 2- - 2e- = S + O (OXYGEN) This ex ...
