Bài 2:
\(BaCO_3\xrightarrow[]{t^o}BaO+CO_2\)
\(BaO+H_2O\rightarrow Ba\left(OH\right)_2\)
\(Ba\left(OH\right)_2+K_2SO_4\rightarrow BaSO_4\downarrow+2KOH\)
\(BaO+2HCl\rightarrow BaCl_2+H_2O\)
\(Ba\left(OH\right)_2+2HNO_3\rightarrow Ba\left(NO_3\right)_2+2H_2O\)
Bài 3:
Ta có: \(\left\{{}\begin{matrix}n_{CO_2}=\dfrac{3,136}{22,4}=0,14\left(mol\right)\\n_{NaOH}=\dfrac{12,8}{40}=0,32\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Tạo muối trung hòa, bazơ dư
PTHH: \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)
Tính theo CO2 \(\Rightarrow\left\{{}\begin{matrix}n_{Na_2CO_3}=0,14\left(mol\right)\\n_{NaOH\left(dư\right)}=0,04\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Na_2CO_3}=0,14\cdot106=14,84\left(g\right)\\m_{NaOH\left(dư\right)}=0,04\cdot40=1,6\left(g\right)\end{matrix}\right.\)