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a. \(n_{CO_2}=0,02\left(mol\right);n_{Ca\left(OH\right)_2}=0,008\left(mol\right)\Rightarrow n_{OH^-}=0,016\\ Tacó:\dfrac{n_{OH^-}}{n_{CO_2}}=\dfrac{0,016}{0,02}=0,8\Rightarrow ChỉtạoCa\left(HCO_3\right)_2,CO_2dư\\ 2CO_2+Ca\left(OH\right)_2\rightarrow Ca\left(HCO_3\right)_2+H_2O\\ n_{Ca\left(HCO_3\right)_2}=n_{Ca\left(OH\right)_2}=0,016\left(mol\right)\\ \Rightarrow CM_{Ca\left(HCO_3\right)_2}=\dfrac{0,016}{0,4}=0,04M\)
\(b.n_{SO_2}=0,18\left(mol\right);n_{Ba\left(OH\right)_2}=0,2\left(mol\right)\Rightarrow n_{OH^-}=0,4\left(mol\right)\\Tacó:\dfrac{n_{OH^-}}{n_{CO_2}}=\dfrac{0,4}{0,18}=2,22\Rightarrow Ba\left(OH\right) _2dư\\ SO_2+Ba\left(OH\right)_2\rightarrow BaCO_3+H_2O\\ n_{Ba\left(OH\right)_2dư}=0,2-0,18=0,02\left(mol\right)\\ \Rightarrow CM_{Ba\left(OH\right)_2dư}=\dfrac{0,02}{0,2}=0,1M\)
a) \(CO2+Ca\left(OH\right)2\rightarrow CaCO3+H2O\)
\(CO2+CaCO3+H2O\rightarrow Ca\left(HCO3\right)2\)
b) \(H3PO4+3NaOH\rightarrow Na3PO4+3H2O\)
\(2Na3PO4+H3PO4\rightarrow3Na2HPO4\)
c)\(Ca\left(OH\right)2+2H3PO4\rightarrow Ca\left(H2PO4\right)2+2H2O\)
\(2Ca\left(OH\right)2+Ca\left(H2PO4\right)2\rightarrow Ca3\left(PO4\right)2+4H2O\)
d)\(3NaOH+AlCl3\rightarrow3NaCl+Al\left(OH\right)3\)
\(2NaOH+2Al\left(OH\right)3\rightarrow2NaAlO2+4H2O\)
e)\(2NaOH+ZnSO4\rightarrow Zn\left(OH\right)2+Na2SO4\)
\(2NaOH+Zn\left(OH\right)2\rightarrow Na2ZnO2+2H2O\)
g) \(HCl+Na2CO3\rightarrow NaCl+NaHCO3\)
\(2HCl+Na2CO3\rightarrow2NaCl+H2O+CO2\)
Chúc bạn học tốt
\(n_{C_2H_4}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\\ C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\\ a,n_{O_2}=3.0,5=1,5\left(mol\right)\\ V_{O_2\left(đktc\right)}=1,5.22,4=33,6\left(l\right)\\ V_{kk\left(đktc\right)}=33,6.5=168\left(l\right)\\ b,n_{CO_2}=n_{H_2O}=2.0,5=1\left(mol\right)\\ m_{CO_2}=44.1=44\left(g\right);m_{H_2O}=18.1=18\left(g\right)\\ c,CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\\ n_{Ca\left(OH\right)_2}=n_{CO_2}=1\left(mol\right)\\ m_{Ca\left(OH\right)_2}=1.74=74\left(g\right)\\ m_{ddCa\left(OH\right)_2}=\dfrac{74.100}{10}=740\left(g\right)\)
1.\(n_{CO_2}=\dfrac{V}{22,4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
\(n_{KOH}=CM.Vdd=2.0,46=0,92\left(mol\right)\)
PTHH:\(CO_2+2KOH\rightarrow K_2CO_3+H_2O\)
TPU: 0,2 0,92
PU: 0,2 0,4 0,2
SPU: 0 0,52 0,2
\(m_{K_2CO_3}=n.M=0,2.138=27,6\left(g\right)\)
2.\(n_{SO_2}=\dfrac{V}{22,4}=\dfrac{8,69}{22,4}=0,4\left(mol\right)\)
\(n_{NaOH}=CM.Vdd=2,5.0,2=0,5\left(mol\right)\)
PTHH:\(SO_2+2NaOH\rightarrow Na_2SO_3+H_2O\)
TPU: 0,4 0,5
PU: 0,25 0,5 0,25
SPU: 0,15 0 0,25
\(m_{Na_2SO_3}=n.M=0,25.126=31,5\left(g\right)\)
Ta có: \(\left\{{}\begin{matrix}n_{CO_2}=\dfrac{0,308}{44}=0,007\left(mol\right)\\n_{Ca\left(OH\right)_2}=2\cdot0,002=0,004\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Tạo 2 muối
PTHH: \(2CO_2+Ca\left(OH\right)_2\rightarrow Ca\left(HCO_3\right)_2\)
2a______a____________a (mol)
\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3\downarrow+H_2O\)
b_______b_________b (mol)
Ta lập được HPT: \(\left\{{}\begin{matrix}2a+b=0,007\\a+b=0,002\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=n_{Ca\left(HCO_3\right)_2}=0,003\left(mol\right)\\b=n_{CaCO_3}=0,001\left(mol\right)\end{matrix}\right.\)
PTHH: \(Ca\left(HCO_3\right)_2+2NaOH\rightarrow CaCO_3\downarrow+Na_2CO_3+2H_2O\)
Ta có: \(n_{NaOH}=\dfrac{5\cdot4\%}{40}=0,005\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,003}{1}>\dfrac{0,005}{2}\) \(\Rightarrow\) Ca(HCO3)2 còn dư
\(\Rightarrow\left\{{}\begin{matrix}n_{Na_2CO_3}=0,0025\left(mol\right)\\n_{Ca\left(HCO_3\right)_2\left(dư\right)}=0,0005\left(mol\right)\\\Sigma n_{CaCO_3}=0,001+0,0025=0,0035\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Na_2CO_3}=0,0025\cdot106=0,265\left(g\right)\\m_{Ca\left(HCO_3\right)_2}=0,0005\cdot162=0,081\left(g\right)\\m_{CaCO_3}=0,0035\cdot100=0,35\left(g\right)\end{matrix}\right.\)
1.nCO2=0,1 (mol )
TH1: Số mol của CO2 dư => Khối lượng muối khan tối đa tạo được là:
mmuối=0,1.84=8,4<9,5 (loại )
TH2: CO2 hết
Gọi số mol CO2 tạo muối Na2CO3;NaHCO3 lần lượt là x, y
2NaOH+CO2→Na2CO3+H2O
NaOH+CO2→NaHCO3
Ta có : \(\left\{{}\begin{matrix}x+y=0,1\\106x+84y=9,5\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,05\\y=0,05\end{matrix}\right.\)
⇒nNaOH=2.0,05+0,05=0,15 (mol)
⇒CMNaOH=\(\dfrac{0,15}{0,1}\)=1,5M
\(1< \dfrac{n_{OH}}{n_{CO_2}}=\dfrac{0,25}{\dfrac{3,36}{22,4}}=1,67< 2\\ Tạo:Na_2CO_3\left(amol\right),NaHCO_3\left(bmol\right)\\ a.2NaOH+CO_2->Na_2CO_3+H_2O\\ NaOH+CO_2->NaHCO_3\\ a+b=\dfrac{3,36}{22,4}=0,15\\ 2a+b=0,25\\ a=0,1;b=0,05\\ m_{Na_2CO_3}=106.0,1=10,6g\\ m_{NaHCO_3}=84.0,05=4,2g\)
a) nco2=v/22.4=0.1 mol
500ml=0.5l
=> nNaoh=Cm.v=0.2 . 0.5=0.1 mol
lập tỉ lệ:
nNaoh/nCo2=0.1/0.1=1
=> sảy ra phương trình
Naoh + co2 ->nahco3
mCo2=n.M=4.4 (g)
mNaoh=n.M=4 (g)
adđlbtkl ta có
mCo2 + mNaoh = mNahco3
=>mNahco3=8.4 (g)
thế còn phần b &c