2HCl +Ba(OH)2--->BaCl2 +2H2O
Ta có
n\(_{HCl}=0,4.0,1=0,04\left(mol\right)\)
Theo pthh
n\(_{Ba\left(OH\right)2}=\frac{1}{2}n_{HCl}=0,02\left(mol\right)\)
C\(_{M\left(Ba\left(OH\right)2\right)}=x=\frac{0,02}{0,2}=0,1\left(M\right)\)
Theo pthh
n\(_{BaCl2}=\frac{1}{2}n_{HCl}=0,02\left(mol\right)\)
C\(_{M\left(Ba\left(OH\right)2\right)}=\frac{0,02}{0,4+0,2}=0,033\left(M\right)\)
Chúc bạn học tốt
\(PTHH:Ba\left(OH\right)2+2HCl\rightarrow BaCl2+2H2O\)Đổi \(400ml=4l\)
Ta có : \(Cm=\frac{n}{v\text{dd}}\Rightarrow nHCl=0,1.4=0,4mol\)
\(\Rightarrow nBa\left(OH\right)2=0,2\left(mol\right)\)
CMBa(OH)2 = 0,4/0,2=2(M)
nBaCl = 0,2mol
=> CM= 0,2/0,4+0,2= 0,33 (M)