Thí nghiệm 2: ${\text{n}}_{{\text{CO}}_2}=0,01$ mol; ${\text{n}}_{\text{HCl}}=0,04$ mol

    ${\text{H}}^{+}+{\text{CO}}_3^{2-}\to {\text{HCO}}_3^{-}$                                                         ${\text{HCO}}_3^{-}+{\text{H}}^{+}\to {\text{CO}}_2+{\text{H}}_2\text{O}$

0,03 mol 0,03 mol                                                                 0,01 mol   0,01 mol

Thí nghiệm 1: ${\text{n}}_{{\text{CaCO}}_3}=0,05$ mol

Bảo toàn nguyên tố $\text{C}:{\text{n}}_{{\text{Na}}_2\text{CO}}+{\text{n}}_{{\text{NaHCO}}_3}={\text{n}}_{{\text{CaCO}}_3}=0,05\to {\text{n}}_{{\text{NaHCO}}_3}=0,02$ mol

      ${\text{HCO}}_3^{-}+{\text{OH}}^{-}\to {\text{CO}}_3^{2-}+{\text{H}}_2\text{O}$      ${\text{Ca}}^{2+}+{\text{CO}}_3^{2-}\to {\text{CaCO}}_3$

      0,02 mol              0,02 mol      0,05 mol   0,05 mol