Nitrophenol is a colorless weak monoprotic acid (pKa = 7.2) whose conjugate base is bright yellow. T — Laboratory Chemistry Question

Nitrophenol is a colorless weak monoprotic acid (pKa = 7.2) whose conjugate base is bright yellow. To 2.00 mL of a solution of 0.0100 M nitrophenol is added 1.00 M NaOH in 0.001 mL portions, and the absorbance of the solution at 485 nm is monitored. What does the graph of A485 as a function of added volume of NaOH look like?