Ta có: \(m_{HCl}=146.5\%=7,3\left(g\right)\Rightarrow n_{HCl}=\dfrac{7,3}{36,5}=0,2\left(mol\right)\)
PT: \(Ca\left(OH\right)_2+2HCl\rightarrow CaCl_2+2H_2O\)
Theo PT: \(n_{Ca\left(OH\right)_2}=\dfrac{1}{2}n_{HCl}=0,1\left(mol\right)\)
\(\Rightarrow V_{ddCa\left(OH\right)_2}=\dfrac{0,1}{2}=0,05\left(l\right)=50\left(ml\right)\)