9. The analyzed solution of hydrochloric acid HCl was diluted in a volumetric flask to 100.0 ml and an aliquot of 20.00 ml was titrated potentiometrically with a NaOH solution of concentration 0.1 mol-eq/dm3. Plot titration curves in coordinates pH = f (VNaOH) and ∆рН/∆V – f (VNaOH) and determine the mass of HCl in the solution using the following data:

V (NaOH), ml 1.50 1.80 1.90 1.95 1.98 2.00 2.02 2.05 2.10
рН 2.64 3.05 3.36 3.64 4.05 6.98 9.95 10.53 10.65

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