Hỗn hợp chất rắn X gồm Ba(HCO

B

- Hướng dẫn giải

Ta có:  \(\left\{ \begin{array}{l}O{H^ - }:4\;mol\\B{a^{2 + }}:2\;mol\\HC{O_3}^ - :2\;mol\\{K^ + }\end{array} \right. \to \left\langle \begin{array}{l}O{H^ - } + HC{O_3}^ - \to C{O_3}^{2 - } + {H_2}O\\B{a^{2 + }} + C{O_3}^{2 - } \to BaC{O_3}\end{array} \right. \Rightarrow \left\{ \begin{array}{l}BaC{O_3}\\KOH\end{array} \right.\left\{ \begin{array}{l}O{H^ - }:4\;mol\\B{a^{2 + }}:2\;mol\\HC{O_3}^ - :2\;mol\\{K^ + }\end{array} \right. \to \left\langle \begin{array}{l}O{H^ - } + HC{O_3}^ - \to C{O_3}^{2 - } + {H_2}O\\B{a^{2 + }} + C{O_3}^{2 - } \to BaC{O_3}\end{array} \right. \Rightarrow \left\{ \begin{array}{l}BaC{O_3}\\KOH\end{array} \right.\)