During the electrolysis of an aqueous salt solution, the pH in the space near one of the electrode w

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During the electrolysis of an aqueous salt solution, the pH in the space near one of the electrode was increased and the other one was decreased. The salt solution was

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For very dilute NaCl solution,Cathode: $2H_{2}O(l) + 2e^{-} \rightarrow H_{2}(g) + 2OH^{-}(aq);P^{H} \uparrow$Anode: $2H_{2}O(l) \rightarrow O_{2}(g) + 4H^{+}(aq) + 4e^{-};P^{H} \downarrow$

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