Sửa đề: 4 g Cu `->` 4 g Ca
Ta có: \(\left\{{}\begin{matrix}n_{Na}=\dfrac{4,6}{23}=0,2\left(mol\right)\\n_{Ca}=\dfrac{4}{40}=0,1\left(mol\right)\end{matrix}\right.\)
PTHH: \(2Na+2H_2O\rightarrow2NaOH+H_2\)
0,2---------------->0,2-------->0,1
\(Ca+2H_2O\rightarrow Ca\left(OH\right)_2+H_2\)
0,1-------------->0,1---------->0,1
`=>` \(\left\{{}\begin{matrix}C_{M\left(NaOH\right)}=\dfrac{0,2}{0,2}=1M\\C_{M\left(Ca\left(OH\right)_2\right)}=\dfrac{0,1}{0,2}=0,5M\\V=\left(0,1+0,1\right).22,4=4,48\left(l\right)\end{matrix}\right.\)