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\(n_{BaCl_2}=\dfrac{208.10\%}{208}=0,1\left(mol\right)\\ a,BaCl_2+H_2SO_4\rightarrow BaSO_4\downarrow+2HCl\\ 0,1............0,1..............0,1.............0,2\left(mol\right)\\ b,m_{ddH_2SO_4}=\dfrac{0,1.98.100}{8}=122,5\left(g\right)\\ c,m_{kt}=m_{BaSO_4}=0,1.233=23,3\left(g\right)\\ d,m_{ddsau}=208+122,5-23,3=307,2\left(g\right)\\ C\%_{ddHCl}=\dfrac{0,2.36,5}{307,2}.100\approx2,376\%\)
PTHH: \(BaCl_2+H_2SO_4\rightarrow2HCl+BaSO_4\downarrow\)
Ta có: \(n_{BaCl_2}=\dfrac{208\cdot10\%}{208}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,2\left(mol\right)\\n_{BaSO_4}=0,1\left(mol\right)=n_{H_2SO_4}\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddH_2SO_4}=\dfrac{0,1\cdot98}{8\%}=122,5\left(g\right)\\m_{BaSO_4}=0,1\cdot233=23,3\left(g\right)\\m_{HCl}=0,2\cdot36,5=7,3\left(g\right)\end{matrix}\right.\)
Mặt khác: \(m_{dd}=m_{ddBaCl_2}+m_{ddH_2SO_4}-m_{BaSO_4}=307,2\left(g\right)\)
\(\Rightarrow C\%_{HCl}=\dfrac{7,3}{307,2}\cdot100\%\approx2,38\%\)
\(n_{FeCl_2}=0,1\times1=0,1\left(mol\right)\)
\(n_{NaOH}=0,3\times2=0,6\left(mol\right)\)
PTHH: FeCl2 + 2NaOH → 2NaCl + Fe(OH)2↓ (1)
Ban đầu: 0,1............0,6............................................... (mol)
Phản ứng: 0,1...........0,2................................................ (mol)
Sau pứ : 0............0,4..........→....0,2............0,1......... (mol)
a) \(m_{Fe\left(OH\right)_2}=0,1\times90=9\left(g\right)\)
Fe(OH)2 \(\underrightarrow{to}\) FeO + H2O (2)
4FeO + O2 \(\underrightarrow{to}\) 2Fe2O3 (3)
Theo Pt2: \(n_{FeO}=n_{Fe\left(OH\right)_2}=0,1\left(mol\right)\)
Theo PT3: \(n_{Fe_2O_3}=\dfrac{1}{2}n_{FeO}=\dfrac{1}{2}\times0,1=0,05\left(mol\right)\)
\(\Rightarrow m_{Fe_2O_3}=0,05\times160=8\left(g\right)\)
b) Chất tan trong dung dịch nước lọc: NaCl và NaOH dư
\(V_{dd}saupư=100+300=400\left(ml\right)=0,4\left(l\right)\)
\(\Rightarrow C_{M_{NaCl}}=\dfrac{0,2}{0,4}=0,5\left(M\right)\)
\(C_{M_{NaOH}}dư=\dfrac{0,4}{0,4}=1\left(M\right)\)
Cảm ơn bạn nhiều lắm!!.
Mà cho mình hỏi là phải tính Fe2O3 hả bạn, tại s v? Tính feo đc k?
Pt:
Fe3O4 + 4H2SO4 → FeSO4 + Fe2(SO4)3 + 4H2O
0,1 → 0,4 0,1 0,1
Cu + Fe2(SO4)3 → CuSO4 + 2FeSO4
0,1 ←0,1 → 0,1 0,2
Rắn B là 0,1 mol Cu → x = 6,4 (g)
Na2CO3 + BaCl2 -> BaCO3 + 2NaCl
nNa2CO3=\(\dfrac{200.10,6\%}{106}=0,2\left(mol\right)\)
nBaCl2=\(\dfrac{150.20,8\%}{208}=0,15\left(mol\right)\)
Vì 0,15<0,2 nên Na2CO3 dư 0,05 mol
Theo PTHH ta có:
nBaCl2=nBaCO3=0,15(mol)
nNaCl=2nBaCl2=0,3(mol)
mNaCl=58,5.0,3=17,55(g)
mBaCO3=197.0,15=29,55(g)
mdd=200+150-29,55=320,45(g)
mNa2CO3=106.0,05=5,3(g)
C% dd Na2CO3=\(\dfrac{5,3}{320,45}.100\%=1,654\%\)
C% dd NaCl=\(\dfrac{17,55}{320,45}.100\%=5,477\%\)
\(a)n_{H_2SO_4}=\dfrac{58,8.20}{100.98}=0,12mol\\ n_{BaCl_2}=\dfrac{200.5,2}{100.208}=0,05mol\\ BaCl_2+H_2SO_4\rightarrow BaSO_4+2HCl\\ \Rightarrow\dfrac{0,12}{1}>\dfrac{0,05}{2}\Rightarrow H_2SO_4.dư\\ BaCl_2+H_2SO_4\rightarrow BaSO_4+2HCl\)
0,05 0,05 0,05 0,1
\(m_{BaSO_4}=0,05.233=11,65g\\ b)m_{dd}=58,8+200-11,65=247,15g\\ C_{\%HCl}=\dfrac{0,1.36,5}{247,15}\cdot100=1,48\%\\ C_{\%H_2SO_4,dư}=\dfrac{\left(0,12-0,05\right).98}{247,15}\cdot100=2,78\%\)