Đáp án đúng: C
0,7 lít.
$\begin{array}{l}\text{HCl}\,\text{+}\,\text{NaAl}{{\text{O}}_{\text{2}}}\,\text{+}\,{{\text{H}}_{\text{2}}}\text{O}\,\xrightarrow{{}}\,\text{NaCl}\,\text{+}\,\text{Al(OH}{{\text{)}}_{\text{3}}}\\\,\,\text{0,5}\,\,\leftarrow \,\text{0,5}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\xrightarrow{{}}\,\,\,\,\,\,\,\,\,\,\,0,5\\\text{3HCl}\,\,\,\text{+}\,\,\text{Al(OH}{{\text{)}}_{3}}\,\xrightarrow{{}}\,AlC{{l}_{3}}\,+\,3{{H}_{2}}O\\\,0,9\,\,\,\leftarrow \,\text{(0,5-0,2)}\\\Rightarrow \,{{\text{n}}_{\text{HCl}}}\,\text{=}\,\text{0,14}\,\Rightarrow \,{{\text{V}}_{\text{dd}\,\text{HCl}}}\,\text{=}\,\text{0,7}\,\text{lit}\end{array}$
