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PTHH: \(SO_2+2NaOH\rightarrow Na_2SO_3+H_2O\)
Ta có: \(n_{NaOH}=0,4\cdot2=0,8\left(mol\right)\)
\(\Rightarrow n_{SO_2}=0,4\left(mol\right)=n_{Na_2SO_3}\) \(\Rightarrow\left\{{}\begin{matrix}V_{SO_2}=0,4\cdot22,4=8,96\left(l\right)\\m_{Na_2SO_3}=0,4\cdot126=50,4\left(g\right)\\C_{M_{Na_2SO_3}}=\dfrac{0,4}{0,4}=1\left(M\right)\end{matrix}\right.\)
$n_{SO_2} = \dfrac{2,24}{22,4} = 0,1(mol0$
$SO_2 + Ca(OH)_2 \to CaSO_3 + H_2O$
$n_{Ca(OH)_2} = n_{SO_2} = 0,1(mol)$
$C_{M_{Ca(OH)_2}} = \dfrac{0,1}{0,2} = 0,5M$
$n_{CaSO_3} = 0,1.120 = 12(gam)$
\(n_{SO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\ a,SO_2+Ca\left(OH\right)_2\rightarrow CaSO_3\downarrow+H_2O\\ n_{Ca\left(OH\right)_2}=n_{SO_2}=n_{CaSO_3}=0,1\left(mol\right)\\b, C_{MddCa\left(OH\right)_2}=\dfrac{0,1}{0,2}=0,5\left(M\right)\\ c,m_{CaSO_3}=120.0,1=12\left(g\right)\)
a)
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 ) = \(n_{Ca\left(OH\right)_2\left(bđ\right)}-n_{Ca\left(OH\right)_2\left(pư\right)}\)
\(=0,014-0,001=0,004\left(mol\right)\)
$n_{SO_2} = \dfrac{3,7185}{22,4} = 0,166(mol)$
\(SO_2+Ba\left(OH\right)_2\text{→}BaSO_3+H_2O\)
0,166 0,166 0,166 (mol)
$C_{M_{Ba(OH)_2}} = \dfrac{0,166}{0,3} = 0,553M$
$m_{BaSO_3} = 0,166.217 = 36,022(gam)$
\(n_{MgCl_2}=0,15.0,2=0,03(mol)\\ PTHH:MgCl_2+2NaOH\to Mg(OH)_2\downarrow +2NaCl\\ a,n_{Mg(OH)_2}=n_{MgCl_2}=0,03(mol)\\ \Rightarrow m_{\downarrow}=m_{Mg(OH)_2}=0,03.58=1,74(g)\\ b,n_{NaOH}=2n_{MgCl_2}=0,06(mol)\\ \Rightarrow C_{M_{NaOH}}=\dfrac{0,06}{0,3}=0,2M\\ c,PTHH:Mg(OH)_2\xrightarrow{t^o}MgO+H_2O\\ \Rightarrow n_{MgO}=n_{Mg(OH)_2}=0,03(mol)\\ \Rightarrow m_{A}=m_{MgO}=0,03.40=1,2(g)\)
nHCl=0,3.2=0,6(mol)
a) PTHH: CuO +2 HCl -> CuCl2 + H2O
0,3_______________0,6___0,3(mol)
b) mCuO=0,3.80=24(g)
c) VddCuCl2=VddHCl=0,3(l)
=>CMddCuCl2=0,3/0,3=1(M)
d) m(muối)=0,3.135=40,5(g)
Bài 1:
a) PTHH: 2 NaOH + SO2 -> Na2SO3 + H2O
nSO2= 5,6/22,4= 0,25(mol)
b) nNa2SO3= nSO2 = 0,25(mol)
=> mNa2SO3= 0,25. 126= 31,5(g)
c) nNaOH= 2.0,25= 0,5(mol)
=> VddNaOH = 0,5/1,25= 0,4 (l)
d) VddNa2SO3= VddNaOH= 0,4(l)
=> \(C_{MddNa_2SO_3}=\dfrac{0,25}{0,4}=0,625\left(M\right)\)
Bài 2:
a) PTHH: CO2 + Ca(OH)2 -> CaCO3 (trắng) + H2O
mCa(OH)2= (7,4.100)/100= 29,6(g)
=> nCa(OH)2 = 29,6/ 74= 0,4(mol)
b) => nCaCO3= nCO2= nCa(OH)2= 0,4(mol)
=> m(muối)= mCaCO3= 100.0,4= 40(g)
c) V(CO2, đktc)= 0,4.22,4= 8,96(l)
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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