Dung dịch X chứa 0,01 mol \[{H_2}NC{H_2}COOH,\] 0,03 mol \[HCOO{C_6}{H_5}\]và 0,02 mol \[Cl{H_3}N - C{H_2}COOH\]. Để tác dụng hết với dung dịch X cần tối đa V mL dung dịch NaOH 0,5M. Giá trị của V là 

Phương trình hóa học:

\(\begin{array}{l}{{\rm{H}}_2}{\rm{NC}}{{\rm{H}}_2}{\rm{COOH}} + {\rm{NaOH}} \to {{\rm{H}}_2}{\rm{NC}}{{\rm{H}}_2}{\rm{COONa}} + {{\rm{H}}_2}{\rm{O}}\\\,\,\,\,\,\,\,\,\,\,\,0,01\,\,\,\,\,\;\; \to \;\,\,\,\,\,\,\,\,\,0,01{\rm{ }}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,mol\end{array}\)

\(\begin{array}{l}{\rm{HCOO}}{{\rm{C}}_6}{{\rm{H}}_5} + 2{\rm{NaOH}} \to {\rm{HCOONa}} + {{\rm{C}}_6}{{\rm{H}}_5}{\rm{ONa}} + {{\rm{H}}_2}{\rm{O}}\\\,\,\,\,\,0,03{\rm{ }}\;\; \to \,\,\,\,\,\,\,\,\,\,\,\,0,06{\rm{ }}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,mol\end{array}\)

\(\begin{array}{l}{\rm{Cl}}{{\rm{H}}_3}\;{\rm{N}} - {\rm{C}}{{\rm{H}}_2}{\rm{COOH}} + 2{\rm{NaOH}} \to {\rm{NaCl}} + {{\rm{H}}_2}{\rm{N}} - {\rm{C}}{{\rm{H}}_2}{\rm{COONa}} + 2{{\rm{H}}_2}{\rm{O}}\\\,\,\,\,\,\,\,\,\,\,\,\,0,02\;\;\;\;\;\;\;\,\,\, \to \;\;\;\,\,\,\,\,\,\,\,\,\,\,\,\,0,04{\rm{ }}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,mol\end{array}\)

\( \Rightarrow {{\rm{n}}_{{\rm{NaOH}}}} = 0,01 + 0,06 + 0,04 = 0,11\) mol \( \Rightarrow {\rm{V}} = \frac{{0,11}}{{0,5}} = 0,22\)lít \( = 220{\rm{mL}}{\rm{.}}\)

Chọn B.