\(m_{ct}=\dfrac{19,6.200}{100}=39,2\left(g\right)\)
\(n_{H2SO4}=\dfrac{39,2}{98}=0,4\left(mol\right)\)
\(m_{ct}=\dfrac{5,2.200}{100}=10,4\left(g\right)\)
\(n_{BaCl2}=\dfrac{10,4}{208}=0,05\left(mol\right)\)
Pt : \(H_2SO_4+BaCl_2\rightarrow2HCl+BaSO_4|\)
1 1 2 1
0,4 0,05 0,1 0,05
a) Lập tỉ số so sánh: \(\dfrac{0,4}{1}>\dfrac{0,05}{1}\)
⇒ H2SO4 dư , BaCl2 phản ứng hết
⇒ Tính toán dựa vào số mol của BaCl2
\(n_{BaSO4}=\dfrac{0,05.1}{1}=0,05\left(mol\right)\)
⇒ \(m_{BaSO4}=0,05.233=11,65\left(g\right)\)
b) \(n_{HCl}=\dfrac{0,05.2}{1}=0,1\left(mol\right)\)
⇒ \(m_{HCl}=0,1.36,5=3,65\left(g\right)\)
\(n_{H2SO4\left(dư\right)}=0,4-0,05=0,35\left(mol\right)\)
⇒ \(m_{H2SO4\left(dư\right)}=0,35.98=34,3\left(g\right)\)
\(m_{ddspu}=200+200-11,65=388,35\left(g\right)\)
\(C_{ddHCl}=\dfrac{3,65.100}{388,35}=0,94\)0/0
\(C_{ddH2SO4\left(dư\right)}=\dfrac{34,3.100}{388,35}=8,83\)0/0
Chúc bạn học tốt
\(a.n_{H_2SO_4}=\dfrac{200.19,6\%}{98}=0,4\left(mol\right)\\ n_{BaCl_2}=\dfrac{200.5,2\%}{208}=0,05\left(mol\right)\\ BaCl_2+H_2SO_4\rightarrow BaSO_4\downarrow+2HCl\\ Vì:\dfrac{0,05}{1}< \dfrac{0,4}{1}\\ \Rightarrow H_2SO_4dư\\ n_{BaSO_4}=n_{BaCl_2}=0,05\left(mol\right)\\ \Rightarrow m_{\downarrow}=m_{BaSO_4}=0,05.233=11,65\left(g\right)\\ b.m_{ddsau}=200+200-11,65=388,35\left(g\right)\\ C\%_{ddHCl}=\dfrac{0,05.2.36,5}{388,35}.100\approx0,94\%\\ C\%_{ddH_2SO_4\left(dư\right)}=\dfrac{\left(0,4-0,05\right).98}{388,35}.100\approx8,832\%\)
