a) $Ba(OH)_2 + 2HCl \to BaCl_2 + 2H_2O$
$n_{HCl} = 0,2.0,5 = 0,1(mol)$
$n_{BaCl_2} = \dfrac{1}{2}n_{HCl} = 0,05(mol)$
$m_{BaCl_2} = 0,05.208 = 10,4(gam)$
b) $n_{Ba(OH)_2} = n_{BaCl_2} = 0,05(mol)$
$\Rightarrow V = \dfrac{0,05}{2} = 0,025(lít) = 25(ml)$
Đổi 200ml = 0,2 lít
Ta có: \(n_{HCl}=0,5.0,2=0,1\left(mol\right)\)
a. PTHH: 2HCl + Ba(OH)2 ---> BaCl2 + 2H2O
Theo PT: \(n_{BaCl_2}=\dfrac{1}{2}.n_{HCl}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\)
=> \(m_{BaCl_2}=0,05.208=10,4\left(g\right)\)
b. Theo PT: \(n_{Ba\left(OH\right)_2}=n_{BaCl_2}=0,05\left(mol\right)\)
=> \(V_{dd_{Ba\left(OH\right)_2}}=\dfrac{0,05}{2}=0,025\left(lít\right)=25\left(ml\right)\)
