Đáp án đúng: A
147,75 gam.
$\begin{array}{l}\text{HCO}_{\text{3}}^{\text{-}}\,\text{+}\,\text{O}{{\text{H}}^{\text{-}}}\,\xrightarrow{{}}\,\text{CO}_{\text{3}}^{\text{2-}}\,\text{+}\,{{\text{H}}_{\text{2}}}\text{O}\\\text{0,5}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\xrightarrow{{}}\,\,\,\,\,\,\,\,\,\,\text{0,5}\\\text{B}{{\text{a}}^{\text{2+}}}\,\,\,\text{+}\,\,\,\,\text{CO}_{\text{3}}^{\text{2-}}\,\xrightarrow{{}}\,\text{BaC}{{\text{O}}_{\text{3}}}\downarrow \\\,\,\,\,\,\,\,\,\,\,\,\,\,\text{(0,5}\,\text{+}\,\text{0,25)}\,\to \,\,\,\text{0,75}\\\Rightarrow \,{{\text{m}}_{\text{BaC}{{\text{O}}_{\text{3}}}}}\,\text{=}\,\text{147,75}\,\text{gam}\text{.}\end{array}$
