Phenol, C₆H₅OH, is a weak organic acid. Suppose 0.515 g of the compound is dissolved in enough water to make 125 mL of solution. The resulting solution is titrated with 0.123 M NaOH.
C₆H₅OH(aq) + OH-(aq) ⇆ C₆H₅O-(aq) + H₂O
What is the pH of the original solution of phenol?