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Question

The pH of 0.5 L of 1.0 M NaCl after the electrolysis for 965 s using 5.0 A current is

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Solution

At cathode 2H2O+2eH2+2OHAt anode 2ClCl2+2eMoles of OHformed = zit=1×5×96596500=0.05 mol[OH]=0.050.5=1×101 mol L1pOH=log[OH]=log(0.1)=1 pH=13

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