7. Construct potentiometric titration curves in the coordinates (Е–V) and ((ΔV/ΔЕ) – V) and determine the concentration of CH3COOH, if during titration of 10.0 ml of the analyzed acid solution 0.10 N. KOH solution obtained the following results:
V KOH, ml 10.0 18.0 19.0 19.5 19.9 20.0 20.1 20.5 21.0
E, mV 276 331 350 368 410 510 612 650 668
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