740. Plot potentiometric titration curves in E-V and ΔE/ΔV coordinates. Determine the concentration of HCl if the following results were obtained during titration of 20.00 ml of the analyzed acid solution with 0.1000 N NaOH:
V NaOH, ml 10 18 19 19.9 20 20.1 21 22
pH 1.48 2.28 2.59 3.60 7.00 10.60 11.49 11.68
-E, mV 86 132 150 209 406 615 666 678

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