30. Solving a chemistry problem

10. A solution (V = 20 cm3) containing a mixture of hydrochloric and boric acids was titrated with a 0.1000 mol/dm3 NaOH solution: first titrated with HCl, then after adding glycerol - H3BO3 in the first step. Construct titration curves in pH-V and delta ΔpH/ΔV-V coordinates. Calculate the mass concentrations of HCl and H3BO3. If you get a trace during titration. data:
before adding glycerin:
V(NaOH): 0; 0.40; 0.60; 0.80; 1.00; 1.05; 1.10; 1.20
pH: 2.45; 2.61; 2.72; 2.85; 3.42; 5.82; 9.98; 7.32
After adding glycerin:
V(NaOH): 1.40; 1.60; 1.80; 2.00; 2.10; 2.15; 2.20; 2.25; 2.40
pH: 5.88; 6.26; 6.70; 7.28; 7.67; 8.10; 9.03; 9.75; 10.08.