nCO2 = 3.36/22.4 = 0.15 (mol) 

nCa(OH)2 = 0.125*1 = 0.125 (mol) 

nCO2 / nCa(OH)2 = 0.15/0.125 = 1.2 

=> Tạo ra 2 muối 

Đặt : 

nCaCO3 = x (mol) 

nCa(HCO3)2 = y (mol) 

BT Ca : 

x + y = 0.125 

BT C : 

x + 2y = 0.15 

=> x = 0.1

y = 0.025 

C M Ca(HCO3)2 = 0.025/0.125 = 0.2 (M) 

nCO2=0,15 mol, nBa(OH)2=0,125 mol

1<nOH-/nCO2=0,25/0,15=1,67<2 => Tạo 2 muối

BaCO3: x

Ba(HCO3)2: y

x+y=nBa2+=0,125

x+2y=nC=0,15

=>x=0,1; y=0,025

CM Ba(HCO3)2=0,025/0,125=0,2M

n_CO2 = \(\dfrac{3,36}{22,4}\)= 0,15 mol

n_Ba(OH)2 = 1.0,125 = 0,125 mol

Xét T = \(\dfrac{n_{CO2}}{n_{Ba\left(OH\right)2}}\)= 1,2

Xảy ra pt:

CO₂ + Ba(OH)₂ -> BaCO₃\(\downarrow\)+ H₂O (1)

..x...........x................x

2CO₂ + Ba(OH)₂ -> Ba(HCO₃)₂ (2)

..2y..........y.................y

Từ (1) và (2) ta có hệ: \(\left\{{}\begin{matrix}x+2y=0,15\\x+y=0,125\end{matrix}\right.\)=>\(\left\{{}\begin{matrix}x=0,1\\y=0,025\end{matrix}\right.\)

C_{M BaCO3} = \(\dfrac{0,1}{0,125}\)= 0,8M

C_{M Ba(HCO3)2} = \(\dfrac{0,025}{0,125}\)= 0,2M

Đáp án A

nCO₂=0,15 mol, nBa(OH)₂=0,125 mol

1<nOH^-/nCO₂=0,25/0,15=1,67<2 => Tạo 2 muối

BaCO₃: x

Ba(HCO₃)₂: y

x+y=nBa²⁺=0,125

x+2y=nC=0,15

=>x=0,1; y=0,025

C_{M Ba(HCO3)2}=0,025/0,125=0,2M

Đáp án B

\(n_{CO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)

PTHH :

TH1 : Tỉ lệ 1 : 2 

\(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)

0,05        0,1               0,05 

\(m_{Na_2CO_3}=0,05.106=5,3\left(g\right)\)

\(C\%_{Na_2CO_3}=\dfrac{5,3}{160+0,05.44}.100\%\approx3,27\%\)

TH2 : Tỉ lệ 1 : 1 

\(CO_2+NaOH\rightarrow NaHCO_3\)

0,05      0,05           0,05  

\(m_{NaHCO_3}=0,05.84=4,2\left(g\right)\)

\(C\%_{NaHCO_3}=\dfrac{4,2}{160+0,05.44}.100\%\approx2,59\%\)

a. \(n_{CO_2}=0,02\left(mol\right);n_{Ca\left(OH\right)_2}=0,008\left(mol\right)\Rightarrow n_{OH^-}=0,016\\ Tacó:\dfrac{n_{OH^-}}{n_{CO_2}}=\dfrac{0,016}{0,02}=0,8\Rightarrow ChỉtạoCa\left(HCO_3\right)_2,CO_2dư\\ 2CO_2+Ca\left(OH\right)_2\rightarrow Ca\left(HCO_3\right)_2+H_2O\\ n_{Ca\left(HCO_3\right)_2}=n_{Ca\left(OH\right)_2}=0,016\left(mol\right)\\ \Rightarrow CM_{Ca\left(HCO_3\right)_2}=\dfrac{0,016}{0,4}=0,04M\)

\(b.n_{SO_2}=0,18\left(mol\right);n_{Ba\left(OH\right)_2}=0,2\left(mol\right)\Rightarrow n_{OH^-}=0,4\left(mol\right)\\Tacó:\dfrac{n_{OH^-}}{n_{CO_2}}=\dfrac{0,4}{0,18}=2,22\Rightarrow Ba\left(OH\right) _2dư\\ SO_2+Ba\left(OH\right)_2\rightarrow BaCO_3+H_2O\\ n_{Ba\left(OH\right)_2dư}=0,2-0,18=0,02\left(mol\right)\\ \Rightarrow CM_{Ba\left(OH\right)_2dư}=\dfrac{0,02}{0,2}=0,1M\)

nCO2 = 3,36 : 22,4 = 0,15 mol;     nNaOH=0,3x0,7=0,21mol

Đặt T = nOH / nCO2 = 0,21 / 0,15 = 1,4 

Vid 1 < T < 2 nên pứ tạo 2 muối NaHCO3 và Na2CO3

Hợp thức theo tỉ số T , ta có PTHH chung

   5CO2 + 7NaOH ===> 2Na2CO3 + 3NaHCO3 + 2H2O

  0,16 -------------------------> 0,06 ------------>0,09 mol

C_M(Na2CO3) = 0,06 / 0,3 = 0,2M

C_M(NaHCO3)=0,09 / 0,3 = 0,3M

nCO2=0.15(mol)

nNaOH=0.21(mol)

CO2+2NaOH->Na2CO3+H2O

theo pthh nCO2=1/2 nNaOH

Theo bài ra nCO2=5/7 nNaOH

->CO2 dư

nCO2 dư=0.15-0.21:2=0.045(mol)->CM=0.15(M)

nNa2CO3=0.105(mol)->CM=0.35(M)