Trộn \(100 \mathrm{ml}\) dung dịch \(\text{AlC}{{\text{l}}_{3}}\,\,1\text{M}\) với \(200 \mathrm{ml}\) dung dịch \(\text{NaOH}\,\,\,1,8\text{M}\). Sau khi phản ứng kết thúc, khối l...

* Hướng dẫn giải

\(\begin{array}{l} {\rm{A}}{{\rm{l}}^{3 + }} + 3{\rm{O}}{{\rm{H}}^ - } \to {\rm{Al}}{({\rm{OH}})_3}\\ x\quad \,\,\,\,\,\,\,\,\,3x\quad \,\,\,\,\,\,\,\,\,\,\,\,\,x\\ {\rm{A}}{{\rm{l}}^{3 + }} + 4{\rm{O}}{{\rm{H}}^ - } \to {\rm{Al}}({\rm{OH}})_4^ - \\ y\quad \,\,\,\,\,\,\,\,4y\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,y\\ \left\{ {\begin{array}{*{20}{l}} {x + y = 0,1\left( {{n_{{\rm{A}}{{\rm{l}}^{3 + }}}}} \right)}\\ {3x + 4y = 0,36\left( {{n_{{\rm{O}}{{\rm{H}}^ - }}}} \right)} \end{array} \to \left\{ {\begin{array}{*{20}{l}} {x = 0,04}\\ {y = 0,06} \end{array}} \right.} \right.\\ \to {m_{{\rm{Al}}{{({\rm{OH}})}_3}}} = 3,12g \end{array}\)