2. A mixture of hydrochloric and boric acids was titrated potentiometrically with 0.1000 M 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 pH – V and ΔpH/ΔV – V coordinates, determine the volumes V1 and V2 and calculate the amount (mg) of hydrochloric and boric acids if 20.00 ml of a mixture of acids was taken for analysis and the following data were obtained during titration:
V(NaOH), ml…. 0.00 0.20 0.30 0.40 0.46 0.50 0.55 0.60 added
pH……………. 2.60 2.84 3.02 3.40 3.95 5.58 7.03 7.38 glycerol
V(NaOH), ml…. 0.80 1.00 1.20 1.40 1.45 1.50 1.55 1.60 1.70
pH……………. 5.95 6.25 6.55 7.04 7.28 7.73 8.55 9.10 9.55

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