47. An aqueous solution of Sodium Sulphate () is electrolysed using completely inert Platinum electrodes. During this process, what happens to the macroscopic pH of the uniformly mixed bulk solution?

Question

47. An aqueous solution of Sodium Sulphate ($Na_2SO_4$) is electrolysed using completely inert Platinum electrodes. During this process, what happens to the macroscopic pH of the uniformly mixed bulk solution?

Prashant Kotian · Accepted Answer

Correct answer: C. At the cathode, water is reduced producing and . At the anode, water is oxidised producing and . Because exactly 4 equivalents of and are generated per 4 moles of electrons, they perfectly neutralize each other in the bulk solution, leaving the pH unchanged.

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