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PTHH: \(SO_2+2NaOH\rightarrow Na_2SO_3+H_2O\)
Ta có: \(n_{NaOH}=0,4\cdot2=0,8\left(mol\right)\)
\(\Rightarrow n_{SO_2}=0,4\left(mol\right)=n_{Na_2SO_3}\) \(\Rightarrow\left\{{}\begin{matrix}V_{SO_2}=0,4\cdot22,4=8,96\left(l\right)\\m_{Na_2SO_3}=0,4\cdot126=50,4\left(g\right)\\C_{M_{Na_2SO_3}}=\dfrac{0,4}{0,4}=1\left(M\right)\end{matrix}\right.\)
$n_{SO_2} = \dfrac{3,7185}{22,4} = 0,166(mol)$
\(SO_2+Ba\left(OH\right)_2\text{→}BaSO_3+H_2O\)
0,166 0,166 0,166 (mol)
$C_{M_{Ba(OH)_2}} = \dfrac{0,166}{0,3} = 0,553M$
$m_{BaSO_3} = 0,166.217 = 36,022(gam)$
Na2O+H2O->2NaOH
0,2----------------0,4 mol
2NaOH+CO2->Na2CO3+H2O
0,4--------0,2
n Na2O=12,4\62=0,2 mol
=>C% NaOH=0,4.40\12,4+120 .100=3 %
=>m CO2=0,2.44=8,8g
$n_{SO_2} = \dfrac{2,24}{22,4} = 0,1(mol0$
$SO_2 + Ca(OH)_2 \to CaSO_3 + H_2O$
$n_{Ca(OH)_2} = n_{SO_2} = 0,1(mol)$
$C_{M_{Ca(OH)_2}} = \dfrac{0,1}{0,2} = 0,5M$
$n_{CaSO_3} = 0,1.120 = 12(gam)$
\(n_{SO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\ a,SO_2+Ca\left(OH\right)_2\rightarrow CaSO_3\downarrow+H_2O\\ n_{Ca\left(OH\right)_2}=n_{SO_2}=n_{CaSO_3}=0,1\left(mol\right)\\b, C_{MddCa\left(OH\right)_2}=\dfrac{0,1}{0,2}=0,5\left(M\right)\\ c,m_{CaSO_3}=120.0,1=12\left(g\right)\)
a, \(Na_2O+H_2O\rightarrow2NaOH\)
\(n_{Na_2O}=\dfrac{15,5}{62}=0,25\left(mol\right)\)
Theo PT: \(n_{NaOH}=0,25.2=0,5\left(mol\right)\)
\(\Rightarrow C_{M_{NaOH}}=\dfrac{0,5}{0,5}=1\left(M\right)\)
b, \(H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O\)
Theo PT: \(n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=0,25\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}=0,25.98=24,5\left(g\right)\)
\(\Rightarrow m_{ddH_2SO_4}=\dfrac{24,5}{20\%}=122,5\left(g\right)\)
\(\Rightarrow V_{ddH_2SO_4}=\dfrac{122,5}{1,14}\approx107,5\left(ml\right)\)
\(a.2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\\ b.n_{NaOH}=\dfrac{20}{40}=0,5\left(mol\right)\\ n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=0,25\left(mol\right)\\ \Rightarrow CM_{H_2SO_4}=\dfrac{0,25}{0,1}=2,5M\\ c.n_{Na_2SO_4}=\dfrac{1}{2}n_{NaOH}=0,25\left(mol\right)\\ \Rightarrow m_{Na_2SO_4}=0,25.142=35,5\left(g\right)\)
\(n_{MgCl_2}=0,15.0,2=0,03(mol)\\ PTHH:MgCl_2+2NaOH\to Mg(OH)_2\downarrow +2NaCl\\ a,n_{Mg(OH)_2}=n_{MgCl_2}=0,03(mol)\\ \Rightarrow m_{\downarrow}=m_{Mg(OH)_2}=0,03.58=1,74(g)\\ b,n_{NaOH}=2n_{MgCl_2}=0,06(mol)\\ \Rightarrow C_{M_{NaOH}}=\dfrac{0,06}{0,3}=0,2M\\ c,PTHH:Mg(OH)_2\xrightarrow{t^o}MgO+H_2O\\ \Rightarrow n_{MgO}=n_{Mg(OH)_2}=0,03(mol)\\ \Rightarrow m_{A}=m_{MgO}=0,03.40=1,2(g)\)
a)
PTHH : \(SO_2+Ca\left(OH\right)_2\rightarrow CáO_4+H_2O\)
b)
Ta có :
\(n_{SO_2}=\frac{0,224}{22,4}=0,01\left(mol\right)\)
\(n_{Ca\left(OH\right)_2}=0,01\times1,4=0,014\)
Theo ptpư : \(n_{SO_2}=n_{Ca\left(OH\right)_2}=n_{CaSO_3}=n_{H_2O}\)
Vậy nCa(OH)2 ( dư ) = \(n_{Ca\left(OH\right)_2\left(bđ\right)}-n_{Ca\left(OH\right)_2\left(pư\right)}\)
\(=0,014-0,001=0,004\left(mol\right)\)
\(n_{H_2}=\dfrac{2,479}{22,4}=\dfrac{2479}{22400}mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Theo pt ta có: \(n_{Zn}=n_{H_2}=\dfrac{2479}{22400}mol\)\(\approx0,11mol\)
\(\Rightarrow m_{Zn}\approx7,2g\)
\(n_{HCl}=2n_{H_2}=0,22mol\) \(\Rightarrow C_{M_{HCl}}=\dfrac{0,22}{0,1}=2,2M\)
400ml = 0,4l
\(n_{NaOH}=2.0,4=0,8\left(mol\right)\)
a) Pt : \(SO_2+2NaOH\rightarrow Na_2SO_3+H_2O|\)
1 2 1 1
0,4 0,8 0,4
b) \(n_{SO2}=\dfrac{0,8.1}{2}=0,4\left(mol\right)\)
\(V_{SO2\left(dktc\right)}=0,4.22,4=8,96\left(l\right)\)
c) \(n_{Na2SO3}=\dfrac{0,8.1}{2}=0,4\left(mol\right)\)
⇒ \(m_{Na2SO3}=0,4.126=50,4\left(g\right)\)
c) \(C_{M_{Na2SO3}}=\dfrac{0,4}{0,4}=1\left(M\right)\)
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