30. A mixture of hydrochloric and boric acids was titrated potentiometrically with 0.1000 M NaOH sequentially: first titrated with HCl (using up the volume of titrant V1), then glycerol was added to the solution and titrated with H3BO3 in the first step (receiving the total volume of titrant V2).
Construct titration curves in coordinates pH -V and ∆рН/∆V- V, determine the volumes V1 and V2 and calculate the concentration of HCl and H3BO3 (r/l), if 20.00 ml of a mixture of acids was taken for analysis and the following were obtained during titration data:
Option 2
V(NaOH), ml. 0 00 0.40 0.60 0.80 1.00 1.05 1.10 1.20 added
pH 2.45 2.61 2.72 2.85 3.42 5.82 6.98 7.32 glycerol
V(NaOH), ml 1.4 1.60 1.80 2.00 2.10 2.15 2.20 2.25 2.40
pH 5.9 6.26 6.70 7.28 7.67 8.10 9.03 9.75 10.28

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