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\(n_{CH_3COOH}=0.5\cdot1=0.5\left(mol\right)\)
\(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
\(0.5.....................0.5..................0.5\)
\(m_{CH_3COOH}=0.5\cdot60=30\left(g\right)\)
\(m_{CH_3COONa}=0.5\cdot82=41\left(g\right)\)
\(m_{NaOH}=0.5\cdot40=20\left(g\right)\)
\(n_{Na_2CO_3}=0.1\cdot0.5=0.05\left(mol\right)\)
\(2CH_3COOH+Na_2CO_3\rightarrow2CH_3COONa+CO_2+H_2O\)
\(2.........................1\)
\(0.5.......................0.05\)
\(LTL:\dfrac{0.5}{2}>\dfrac{0.05}{1}\Rightarrow CH_3COOHdư\)
\(V_{CO_2}=0.05\cdot22.4=1.12\left(l\right)\)
Ta có: \(n_{NaOH}=0,1.0,5=0,05\left(mol\right)\)
PT: \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
Theo PT: \(n_{CH_3COOH}=n_{CH_3COONa}=n_{NaOH}=0,05\left(mol\right)\)
a, \(C_{M_{CH_3COOH}}=\dfrac{0,05}{0,2}=0,25\left(M\right)\)
b, \(m_{CH_3COONa}=0,05.82=4,1\left(g\right)\)
a, \(n_{CO_2}=\dfrac{2,479}{24,79}=0,1\left(mol\right)\)
PT: \(MgO+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2O\)
\(MgCO_3+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+CO_2+H_2O\)
Theo PT: \(n_{MgCO_3}=n_{CO_2}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{MgCO_3}=\dfrac{0,1.84}{10,4}.100\%\approx80,77\%\\\%m_{MgO}\approx19,23\%\end{matrix}\right.\)
b, \(n_{MgO}=\dfrac{10,4-0,1.84}{40}=0,05\left(mol\right)\)
Theo PT: \(n_{CH_3COOH}=2n_{MgO}+2n_{MgCO_3}=0,3\left(mol\right)\)
\(\Rightarrow C_{M_{CH_3COOH}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\)
\(n_{Na_2CO_3}=\dfrac{21,6}{106}\)
Số lẻ lắm em, em xem 21,6 hay 21,2 gam nhé!
\(Na_2CO_3(0,05)+2CH_3COOH(0,1)--->2CH_3COONa(0,1)+CO_2(0,05)+H_2O\)
\(m_{Na_2CO_3}=\dfrac{10,6.50}{100}=5,3\left(g\right)\)
\(\Rightarrow n_{Na_2CO_3}=0,05\left(mol\right)\)
Phản ứng vừa đủ:
Theo PTHH: \(nCH_3COOH=0,1\left(mol\right)\)
\(\Rightarrow m_{CH_3COOH}=60.0,1=6\left(g\right)\)
\(b)\)
Theo PTHH: \(n_{CO_2}=0,05\left(mol\right)\)
\(\Rightarrow m_{CO_2}=2,2\left(g\right)\)
\(m_{ddsau}=50+50-2,2=97,8\left(g\right)\)
Dung dich muối tạo thành là CH3COONa
Theo PTHH: \(n_{CH_3COONa}=0,1\left(mol\right)\)
\(\Rightarrow m_{CH_3COONa}=82.0,1=8,2\left(g\right)\)
\(\Rightarrow C\%CH_3COONa=\dfrac{8,2}{97,8}.100\%=8,38\%\)
Số mol HCl tham gia pư là
nHCl = 0.6(mol)
gọi số mol K2CO3 = x (mol)
số mol Na2CO3 = y(mol)
Ta có : x + y = nCO2 = 0.25(mol)
theo bra ta có pt
K2CO3 + 2HCl ---> 2KCl + H2O + CO2
x----------->2x-------------------------...
Na2CO3 + 2HCl ---> 2NaCl + H2O + CO2
y-------------->2y----------------------... Vậy số mol HCl pư là
n(HCl) = 2 x 0.25 = 0.5(mol)
Vậy số mol HCl còn dư là
n(HCl dư) = 0.1(mol) = nNaOH( pt HCl+ NaOH---> NaCl + H2O)
muối khan là NaOH
Vậy ta có dd thu được gồm : K(+) , Na(+), Cl(-) , Na(+)
Ta có : 78x + 46y = 39.9 - 0.6*35.5 - 23*0.1 = 16.3
Lâp hệ gồm pt : x+y =0,25 => x=0,15; y=0,1
78x+ 46y= 16,3
Vậy m(K2CO3)=n.M = 0,15 . 138=20,7 g
m( Na2CO3)= n.M= 0,1 . 106=10,6 (g)
vậy m (hh) là 20,7 + 10,6= 31,3(g)
Vậy % m (K2CO3) = 20,7: 31,3.100%=66,15 %( xấp xỉ)
% m( Na2CO3)= 100%- 66,15%=33,85%
CH3COOH + NaOH => CH3COONa + H2O
mNaOH = 60x10/100 = 6(g)
==> nNaOH = m/M = 0.15 (mol)
Theo pt => nCH3COOH = 0.15 (mol)
mCH3COOH = n.M = 0.15x60 = 9 (g)
C% = 9x100/500 = 1.8%
2CH3COOH + Na2CO3 => 2CH3COONa + CO2 + H2O
nNa2CO3 = 0.1 (mol) > 0.15/2
VCO2 = 22.4n = 22.4 x 0.075 = 1.68 (l)
\(n_{CH_3COOH}=0.5\cdot1=0.5\left(mol\right)\)
\(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
\(0.5...........................................0.5\)
\(m_{CH_3COOH}=0.5\cdot60=30\left(g\right)\)
\(m_{CH_3COONa}=0.5\cdot82=41\left(g\right)\)
\(n_{Na_2CO_3}=0.2\cdot0.5=0.1\left(mol\right)\)
\(2CH_3COOH+Na_2CO_3\rightarrow2CH_3COONa+CO_2+H_2O\)
\(0.2.........................0.1\)
\(\Rightarrow CH_3COOHdư\)
\(n_{CO_2}=n_{Na_2CO_3}=0.1\left(mol\right)\)
\(V_{CO_2}=0.1\cdot22.4=2.24\left(l\right)\)