question_answer

pH of the solution: \[\left( \begin{align}   & \text{10}\,\underset{+}{\mathop{\text{litre}\,}}\,\text{of}\,\text{0}\text{.03}\,\text{NX}\,{{\text{(OH)}}_{\text{2}}}\text{(strong}\,\text{diacidic}\,\text{base)} \\  & \text{5}\,\text{litre}\,\text{of}\,\text{0}\text{.08}\,\text{M}\,\text{HN}{{\text{O}}_{\text{3}}} \\  & \text{485}\,\overset{+}{\mathop{\text{litre}}}\,\,\text{of}\,\text{0}\text{.01}\,\text{M}\,\text{NaN}{{\text{O}}_{\text{3}}} \\ \end{align} \right)\]

A)  3.7                        

B)  11.0

C)  7.0                        

D)  10.0