Construct potentiometric titration curves in the coordinates E - V and ΔE / ΔV - V. Determine the concentration of HCl, if the following results were obtained when titrating 20.00 ml of the analyzed acid solution with 0.1000 N NaOH solution:

Vcon, ml 10.0 18.0 19.0 19.9 20.0 20.1 21.0 22.0
pH 1.48 2.28 2.59 3.60 7.0 10.60 11.49 11.68
-E, mV 86 132 150 209 406 615 666 678

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