135. Solving a chemistry problem

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A465. Plot potentiometric titration curves in pH-V and ∆рН/∆V –V coordinates. Determine the concentration of HCl, if the following results were obtained when titrating 20 ml of the analyzed acid solution with 0.1000 M 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

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