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\(a.300ml=0,3l\\ n_{Ba\left(OH\right)_2}=0,3.0,5=0,15mol\\ Ba\left(OH\right)_2+2HCl\rightarrow BaCl_2+2H_2O\)
0,15 0,3 0,15
\(200ml=0,2l\\ C_{M_{HCl}}=\dfrac{0,3}{0,2}=1,5M\\ b.C_{M_{BaCl_2}}=\dfrac{0,15}{0,3+0,2}=0,3M\)
\(n_{NaOH}=0.2\cdot0.5=0.1\left(mol\right)\)
\(n_{CuSO_4}=0.1\cdot2=0.2\left(mol\right)\)
\(2NaOH+CuSO_4\rightarrow Na_2SO_4+Cu\left(OH\right)_2\)
\(0.1.............0.05...............0.05...........0.05\)
\(m_{Cu\left(OH\right)_2}=0.05\cdot98=4.9\left(g\right)\)
\(C_{M_{Na_2SO_4}}=\dfrac{0.05}{0.2+0.1}=0.167\left(M\right)\)
\(C_{M_{CuSO_4\left(dư\right)}}=\dfrac{0.2-0.05}{0.1}=1.5\left(M\right)\)
\(V_{\text{dd}}=0,2+0,3=0,5\left(l\right)\\ n_{HCl}=0,2.1+0,3.0,5=0,35\\ C_M=\dfrac{0,35}{0,5}=0,7M\)
200ml = 0,2(l)
=> nHCl (1) = 0,2 .1 = 0,2 (mol)
300ml = 0,3 (l)
=> nHCl(2) = 0,3 . 0,5 = 0,15 (mol)
=> CM (sau khi trộn) = n/V = (0,15+0,2) / (0,2+0,3 ) = 0,35 / 0,5 = 0,7 M
2NaOH + CuSO4 → Cu(OH)2 + Na2SO4
n NaOH = 0,2.5 = 1(mol)
n CuSO4 = 0,1.2 = 0,2(mol)
Ta có :
n NaOH / 2 = 0,5 > n CuSO4 / 1 = 0,2 => NaOH dư
n Cu(OH)2 = n CuSO4 = 0,2 mol
=> m A = 0,2.98 = 19,6 gam
n Na2SO4 = n CuSO4 = 0,2 mol
n NaOH pư = 2n CuSO4 = 0,4(mol)
V dd = 0,2 + 0,1 = 0,3(lít)
Suy ra:
CM Na2SO4 = 0,2/0,3 = 0,67M
CM NaOH = (1 - 0,4)/0,3 = 2M
\(n_{CuO}=\dfrac{16}{80}=0,2mol\)
\(CuO+2HCl\rightarrow CuCl_2+H_2O\)
0,2 0,4 0,2 0,2
\(C_{M_{HCl}}=\dfrac{n_{HCl}}{V_{HCl}}=\dfrac{0,4}{0,2}=2M\)
\(m_{HCl}=0,4\cdot36,5=14,6g\)
nCuO = 16/80 = 0,2 (mol)
PTHH: CuO + 2HCl -> CuCl2 + H2
Mol: 0,2 ---> 0,4 ---> 0,2 ---> 0,2
CMCuCl2 = 0,2/0,2 = 1M
mHCl = 0,4 . 36,5 = 14,6 (g)
\(n_{Zn}=\dfrac{6.5}{65}=0.1\left(mol\right)\)
\(n_{H_2SO_4}=0.3\cdot1=0.3\left(mol\right)\)
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
\(0.1........0.1...........0.1.......0.1\)
\(\Rightarrow H_2SO_4dư\)
\(n_{H_2SO_4\left(dư\right)}=0.3-0.1=0.2\left(mol\right)\)
\(n_{ZnSO_4}=n_{H_2}=0.1\left(mol\right)\)
\(C_{M_{ZnSO_4}}=\dfrac{0.1}{0.3}=0.33\left(M\right)\)
\(C_{M_{H_2SO_4\left(dư\right)}}=\dfrac{0.2}{0.3}=0.66\left(M\right)\)
\(a) Zn + H_2SO_4 \to ZnSO_4 + H_2\\ b) n_{Zn} = \dfrac{6,5}{65} = 0,1 < n_{H_2SO_4} =0,3 \to H_2SO_4\ dư\\ n_{H_2SO_4\ pư} = n_{ZnSO_4} = n_{Zn} = 0,1(mol)\\ n_{H_2SO_4\ dư} = 0,3 - 0,1 = 0,2(mol)\\ c) C_{M_{ZnSO_4}} = \dfrac{0,1}{0,3} = 0,33M\\ C_{M_{H_2SO_4}} = \dfrac{0,2}{0,3} = 0,67M\)
HCl + NaOH ➜ NaCl + H2O
\(n_{HCl}=0,2\times0,5=0,1\left(mol\right)\)
\(n_{NaOH}=0,3\times1=0,3\left(mol\right)\)
Theo PT: \(n_{HCl}=n_{NaOH}\)
Theo bài: \(n_{HCl}=\dfrac{1}{3}n_{NaOH}\)
Vì \(\dfrac{1}{3}< 1\) ⇒ dd HCl hết, dd NaOH dư
Theo PT: \(n_{NaCl}=n_{HCl}=0,1\left(mol\right)\)
Theo PT: \(n_{NaOH}pư=n_{HCl}=0,1\left(mol\right)\)
\(\Rightarrow n_{NaOH}dư=0,3-0,1=0,2\left(mol\right)\)
\(\Sigma V_{dd}=0,2+0,3=0,5\left(l\right)\)
\(\Rightarrow C_{M_{NaCl}}=\dfrac{0,1}{0,5}=0,2\left(M\right)\)
\(C_{M_{NaOH}}dư=\dfrac{0,2}{0,5}=0,4\left(M\right)\)