Sửa đề : Ca(OH)2 0.01 M
\(n_{CO_2}=\dfrac{0.2688}{22.4}=0.012\left(mol\right)\)
\(n_{OH^-}=0.2\cdot0.1+0.2\cdot0.01\cdot2=0.024\left(mol\right)\)
\(\dfrac{n_{OH^-}}{n_{CO_2}}=\dfrac{0.024}{0.012}=2\)
\(\Rightarrow\text{Tạo ra muối trung hòa}\)
\(2OH^-+CO_2\rightarrow CO_3^{2-}+H_2O\)
\(0.024......0.012.......0.012\)
\(m_M=m_{Ca^{2+}}+m_{Na^+}+m_{CO_3^{2-}}=0.002\cdot40+0.02\cdot23+0.012\cdot60=1.26\left(g\right)\)