Q7(b). Titration of phenol with NaOH

Phenol (C₆H₅OH) is a weak organic acid. Suppose 0.515 g of the said compound is dissolved in enough water to make 125 mL of the solution. The resulting solution is titrated with 0.123 M NaOH. [Given: Kₐ (phenol) =1.3×10⁻¹⁰ at 25°C] (i) What is the pH of the original solution of phenol? (ii) What are the concentrations of all of the following ions at the equivalence point? Na⁺, H₃O⁺, OH⁻ and C₆H₅O⁻. (iii) What is the pH of the solution at the equivalence point?