A 225ml sample of 0.24M formic acid, HA,(ka= 1.8104) is titrated w/ 0.30MNaOH calculate the pH after 50ml of NaOH has been added. \begin{tabular}{|r|} \hline 4.56 \\ \hline 5.27 \\ \hline 4.12 \\ \hline 3.16 \\ \hline 2.83 \\ \hline 4.85 \\ \hline 3.33 \\ \hline 3.57 \end{tabular}