Bài 23 : 

n BaCO3 = 0,1(mol) > n Ba(OH)2 = 0,15 mol

- TH1 : Ba(OH)2 dư

$Ba(OH)_2 + CO_2 \to BaCO_3 + H_2O$

n CO2 = n BaCO3 = 0,1(mol)

=> V = 0,1.22,4 = 2,24 lít

- TH1 : BaCO3 bị hòa tan một phần

$Ba(OH)_2 + CO_2 \to BaCO_3 + H_2O(1)$
$Ba(OH)_2 + 2CO_2 \to Ba(HCO_3)_2(2)$

n CO2(1) = n Ba(OH)2 (1) = n BaCO3 = 0,1(mol)

=> n Ba(OH)2 (2) = 0,15 - 0,1 = 0,05(mol)

=> n CO2 (2) = 2n Ba(OH)2 (2) = 0,1(mol)

=> V = (0,1 + 0,1).22,4 = 4,48 lít

Bài 24 : 

$Ca(OH)_2 + CO_2 \to CaCO_3 + H_2O$

n Ca(OH)2 = n CO2 = 2,24/22,4 = 0,1(mol)

CM Ca(OH)2 = 0,1/0,2 = 0,5M

Bài 27 : 

n CO2 = 0,1(mol)

Ta có : 

 n CO2 /  n Ca(OH)2 = 0,1/0,25 = 0,4 < 1

Do đó, sản phẩm muối gồm CaCO3 do Ca(OH)2 dư

Câu 25 : 

$CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O$

$2CO_2 + Ca(OH)_2 \to Ca(HCO_3)_2$

Vì thu được hai muối nên : 

1 < a/b < 2

<=> b < a < 2b

\(n_{CO_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)

PT: \(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\)

Theo PT:  \(n_{Ca\left(OH\right)_2}=n_{CaCO_3}=n_{CO_2}=0,25\left(mol\right)\)

a, \(C_{M_{Ca\left(OH\right)_2}}=\dfrac{0,25}{0,1}=2,5\left(M\right)\)

b, \(m_{CaCO_3}=0,25.100=25\left(g\right)\)

c, \(Ca\left(OH\right)_2+2HCl\rightarrow CaCl_2+2H_2O\)

Theo PT: \(n_{HCl}=2n_{Ca\left(OH\right)_2}=0,5\left(mol\right)\)

\(\Rightarrow m_{ddHCl}=\dfrac{0,5.36,5}{20\%}=91,25\left(g\right)\)

Đáp án C

n_CO2 = 1 mol

n_Ca(OH)2 = 0,75 mol => n_OH-= 1,5 mol

n_{kết tủa} = n_OH-- n_CO2= 1,5-1 =0,5 mol

m_CaCO3 = 0,5.100 = 50 gam

\(n_{SO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

PTHH :

\(SO_2+Ca\left(OH\right)_2\rightarrow H_2O+CaSO_3\downarrow\)

0,28       0,28             0,28      0,28 

\(n_{CaSO_3}=\dfrac{33,6}{120}=0,28\left(mol\right)\)

\(\dfrac{0,3}{1}>\dfrac{0,28}{1}\) => tính theo CaSO3 

\(m_{Ca\left(OH\right)_2}=0,28.74=20,72\left(g\right)\)

\(a,C\%_{Ca\left(OH\right)_2}=\dfrac{20,72}{500}.100\%=4,144\%\)

\(b,C\%_A=\dfrac{33,6}{0,3.64+500}.100\%\approx6,14\%\)

Ta có: \(n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

a, PT: \(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)

______0,2_____0,2_________0,2 (mol)

b, \(C_{M_{Ca\left(OH\right)_2}}=\dfrac{0,2}{0,5}=0,4M\)

c, \(m_{CaCO_3}=0,2.100=20\left(g\right)\)

Bạn tham khảo nhé!

a, Ta có : \(\left\{{}\begin{matrix}n_{CaCO3}=\dfrac{m}{M}=0,2\left(mol\right)\\n_{Ca\left(OH\right)2}=C_M.V=0,4\left(mol\right)\end{matrix}\right.\)

\(BTNT\left(Ca\right):n_{Ca\left(HCO_3\right)_2}=n_{Ca\left(OH\right)2}-n_{CaCO3}=0,2\left(mol\right)\)

\(BTNT\left(C\right):n_{CO2}=n_{CaCO3}+2n_{Ca\left(HCO3\right)2}=0,6\left(mol\right)\)

\(\Rightarrow V_{CO2}=13,44l\)

b, Ta có : \(\left\{{}\begin{matrix}n_{BaCO3}=\dfrac{m}{M}=0,025\left(mol\right)\\n_{Ba\left(OH\right)2}=C_M.V=0,2\left(mol\right)\end{matrix}\right.\)

\(BTNT\left(Ba\right):n_{Ba\left(HCO_3\right)_2}=n_{Ba\left(OH\right)2}-n_{BaCO3}=0,175\left(mol\right)\)

\(BTNT\left(C\right):n_{CO2}=n_{BaCO3}+2n_{Ba\left(HCO3\right)2}=0,375\left(mol\right)\)

\(\Rightarrow V_{CO2}=8,4l\)

c, Ta có : \(1< T=\dfrac{n_{NaOH}}{n_{SO2}}=1,875< 2\)

- Áp dụng phương pháp đường chéo :

Ta được : \(\dfrac{n_{NaHSO3}}{n_{Na2SO3}}=\dfrac{1}{7}\)

\(\Leftrightarrow7n_{NaHSO3}-n_{Na2SO3}=0\)

\(BTNT\left(Na\right):n_{NaHSO3}+2n_{Na2SO3}=0,375\)

\(\Rightarrow\left\{{}\begin{matrix}n_{NaHSO3}=0,025\\n_{Na2SO3}=0,175\end{matrix}\right.\)

\(\Rightarrow m_M=24,65g\)

$n_{Ca(OH)_2} = \dfrac{185.20\%}{74} = 0,5(mol)$

$n_{CaCO_3} = 0,3(mol)$

TH1 : Ca(OH)₂ dư

Ca(OH)₂ + CO₂ → CaCO₃ + H₂O

0,3..............0,3.........0,3........................(mol)

V = 0,3.22,4 = 6,72 lít

$m_{dd} = 0,3.44 + 185 - 30 = 168,2(gam)$

$C\%_{Ca(OH)_2\ dư} = \dfrac{(0,5 - 0,3).74}{168,2}.100\% = 8,8\%$

TH2 : Có tạo muối axit

Ca(OH)₂ + CO₂ → CaCO₃ + H₂O

0,3..............0,3.........0,3........................(mol)

Ca(OH)₂ + 2CO₂ → Ca(HCO₃)₂

0,2.............0,4...............0,2.........................(mol)

V = (0,3 + 0,4).22,4 = 15,68 lít

$m_{dd} = 0,7.44 + 185 - 30 = 185,8(gam)$

$C\%_{Ca(HCO_3)_2} = \dfrac{0,2.162}{185,8}.100\% = 17,4\%$

Theo gt ta có: $n_{Ca(OH)_2}=\frac{92}{185}(mol)$

+, Xét trường hợp 1: Chỉ tạo muối $CaCO_3$

$\Rightarrow n_{CO_2}=n_{CaCO_3}=0,3(mol)\Rightarrow V=6,72(l)$

Bảo toàn khối lượng ta có: $m_{dd}=167,2(g)$

$\Rightarrow \%C_{Ca(OH)_2}=8,73\%$

+, Xét trường hợp 2: Tạo 2 muối

Bảo toàn Ca ta có: $n_{Ca(HCO_3)_2}=\frac{73}{370}(mol)$

Bảo toàn C ta có: $n_{CO_2}=\frac{257}{370}(mol)\Rightarrow V_{CO_2}=15,56(l)$

$\Rightarrow \%m_{Ca(HCO_3)_2}=17,3\%$

\(n_{CO_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)

\(n_{Ca\left(OH\right)_2}=0,5.0,6=0,3\left(mol\right)\)

PTHH: Ca(OH)₂ + CO₂ --> CaCO₃ + H₂O

                0,3------>0,3------>0,3

            CaCO₃ + CO₂ + H₂O --> Ca(HCO₃)₂

               0,1<----0,1

=> m_CaCO3 = (0,3-0,1).100 = 20(g)

a) \(n_{CO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\)

Theo PTHH: \(n_{Ca\left(OH\right)_2}=n_{CO_2}=0,1\left(mol\right)\)

\(V_{Ca\left(OH\right)_2}=200ml=0,2l\)

\(\Rightarrow C_{MCa\left(OH\right)_2}=\dfrac{n_{Ca\left(OH\right)_2}}{V_{Ca\left(OH\right)_2}}=\dfrac{0,1}{0,2}=0,5M\)

b) Theo PTHH có: \(n_{CaCO_3}=n_{CO_2}=0,1\left(mol\right)\)

\(\Rightarrow m_{CaCO_3}=n_{CaCO_3}.M_{CaCO_3}=0,1.74=7,4\left(g\right)\)