56. Solving a chemistry problem

43. A weighing of 2.804 g of technical phenol after treatment with sodium hydroxide solution was poured into a 100 ml flask, brought to the mark with water and mixed. With high-frequency titration of a 1 ml sample with 0.1180 M HCl solution, the following results were obtained:
V, ml 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
I, μA 88 83 77 72 66 61 55 55 55 55 55 72 100 126
Calculate the mass fraction of phenol if it is known that the first break in the curve corresponds to the volume of titrant used to neutralize the free alkali.