4. Plot curves of potential changes at 20 C during titration with 0.1 N H2SO4 with 1 N NaOH solution. When titrating, quinhydrone and 0.1 N calomel electrodes are used. Calculation points: 0; 20 ; 50; 90; 99; 99.9; 100; 100.1; 101; 110% of TE.

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