Na2O+H2O\(\rightarrow\)2NaOH
nNaOH=2nNa2O=\(\frac{2.62}{62}\)=2(mol)
nCO2=\(\frac{3,36}{22,4}\)=0,15(mol)
\(\frac{nNaOH}{nCO2}\)=\(\frac{2}{0,15}\)>2
\(\rightarrow\)Tạo Na2CO3
2NaOH+CO2\(\rightarrow\)Na2CO3+H2O
CMNaOH=\(\frac{2}{0,2}\)=10(M)
CmNa2CO3=0,15/0,2=0,75(M)