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\(a)Ba\left(OH\right)_2+Na_2CO_3\rightarrow2NaOH+BaCO_3\\ n_{Ba\left(OH\right)_2}=0,2.2=0,4mol\\ n_{BaCO_3}=n_{Na_2CO_3}=n_{Ba\left(OH\right)_2}=0,4mol\\ m_{BaCO_3}=0,4.171=68,4g\\ b)V_{Na_2CO_3}=\dfrac{0,4}{1}=0,4l\\ c)n_{NaOH}=2n_{Ba\left(OH\right)_2}=0,8mol\\ C_{M\left(NaOH\right)}=\dfrac{0,8}{0,2+0,4}=\dfrac{4}{3}M\)
a) 2CH3COOH + Na2CO3 --> 2CH3COONa + CO2 + H2O
b) \(n_{CH_3COOH}=\dfrac{200.12\%}{60}=0,4\left(mol\right)\)
PTHH: 2CH3COOH + Na2CO3 --> 2CH3COONa + CO2 + H2O
0,4------->0,2------------------------->0,2
=> \(m_{Na_2CO_3}=0,2.106=21,2\left(g\right)\)
=> \(m_{dd.Na_2CO_3}=\dfrac{21,2.100}{50}=42,4\left(g\right)\)
c) \(V_{CO_2}=0,2.22,4=4,48\left(l\right)\)
\(200ml=0,2l\\ n_{Na_2CO_3}=0,5.0,2=0,1\left(mol\right)\\ PTHH:Na_2CO_3+2HCl\rightarrow2NaCl+CO_2\uparrow+H_2O\\ \left(mol\right)........0,1\rightarrow...0,2.......0,2..........0,1.........0,1\\ a,C_{M_{HCl}}=\dfrac{0,2}{0,2}=1\left(M\right)\\ b,m_{NaCl}=0,2.58,5=11,7\left(g\right)\\c, V_{ddNaCl}=V_{ddNa_2CO_3}+V_{ddHCl}=0,2+0,2=0,4\left(l\right)\\ C_{M_{NaCl}}=\dfrac{0,2}{0,4}=0,5\left(M\right)\)
vì em trộn 2 dung dịch lại với nhau mà, ví dụ em đổ 1 chai nước 500ml vào 1 chai nước 500 ml thì mình phải được 1 lít nước chứ
a)
\(n_{Na_2CO_3}=\dfrac{10,6}{106}=0,1\left(mol\right)\)
PTHH: Na2CO3 + 2CH3COOH --> 2CH3COONa + CO2 + H2O
0,1--------->0,2------------->0,2------------>0,1
=> mCH3COOH = 0,2.60 = 12 (g)
\(C_{M\left(dd.CH_3COOH\right)}=\dfrac{0,2}{0,4}=0,5M\)
b) \(n_{C_2H_5OH}=\dfrac{13,8}{46}=0,3\left(mol\right)\)
PTHH: CH3COOH + C2H5OH --H2SO4,to--> CH3COOC2H5 + H2O
Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,3}{1}\) => Hiệu suất tính theo CH3COOH
\(n_{CH_3COOH\left(pư\right)}=\dfrac{0,2.80}{100}=0,16\left(mol\right)\)
PTHH: CH3COOH + C2H5OH --H2SO4,to--> CH3COOC2H5 + H2O
0,16------------------------------------->0,16
=> \(m_{CH_3COOC_2H_5}=0,16.88=14,08\left(g\right)\)
a)
$CH_3COOH + NaHCO_3 \to CH_3COONa + CO_2 + H_2O$
b)
n NaHCO3 = n CH3COOH = 100.12%/60 = 0,2(mol)
m dd NaHCO3 = 0,2.84/8% = 210(gam)
c)
n CO2 = n CH3COOH = 0,2(mol)
=> V CO2 = 0,2.22,4 = 4,48(lít)
d)
m dd = m dd CH3COOH + m dd NaHCO3 - m CO2 = 100 + 210 - 0,2.44 = 301,2(gam)
C% CH3COONa = 0,2.82/301,2 .100% = 5,44%
\(a,PTHH:Na_2CO_3+H_2SO_4\rightarrow Na_2SO_4+H_2O+CO_2\uparrow\\ b,n_{Na_2CO_3}=\dfrac{10,6}{106}=0,1\left(mol\right)\\ \Rightarrow n_{Na_2SO_4}=0,1\left(mol\right)\\ \Rightarrow m_{Na_2SO_4}=0,1\cdot142=14,2\left(g\right)\\ c,n_{CO_2}=n_{Na_2CO_3}=0,1\left(mol\right)\\ \Rightarrow V_{CO_2\left(đktc\right)}=0,1\cdot22,4=2,24\left(l\right)\)
\(d,n_{Ca\left(OH\right)_2}=0,5\cdot0,3=0,15\left(mol\right)\\ PTHH:CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3\downarrow+H_2O\)
Vì \(\dfrac{n_{Ca\left(OH\right)_2}}{1}>\dfrac{n_{CO_2}}{1}\) nên Ca(OH)2 dư, tính theo CO2
\(\Rightarrow n_{CaCO_3}=n_{CO_2}=0,1\left(mol\right)\\ \Rightarrow m_{CaCO_3}=0,1\cdot100\cdot80\%=8\left(g\right)\)
\(m_{CH_3COOH}=24\%.150=36\left(g\right)\\ \rightarrow n_{CH_3COOH}=\dfrac{36}{60}=0,6\left(mol\right)\)
PTHH: 2CH3COOH + Na2CO3 ---> 2CH3COONa + CO2 + H2O
0,6 0,3 0,6 0,3
=> VCO2 = 0,3.22,4 = 6,72 (l)
\(m_{Na_2CO_3}=0,3.31,8\left(g\right)\)
=> \(m_{ddNa_2CO_3}=\dfrac{31,8}{21,2\%}=150\left(g\right)\)
mCO2 = 0,3.44 = 13,2 (g)
\(m_{dd}=150+150-13,2=286,8\left(g\right)\)
\(m_{CH_3COONa}=0,3.82=24,6\left(g\right)\\ \rightarrow C\%_{CH_3COONa}=\dfrac{24,6}{286,8}=8,58\%\)
mH2SO4 =mdd H2SO4.C% : 100% = 400.9,8% :100% = 39,2 (g)
=> nH2SO4 = mH2SO4 : MH2SO4 = 39,2: 98 = 0,4 (mol)
PTHH: H2SO4 + Na2CO3 ---> Na2SO4 + CO2 + H2O
0,4 ---->0,4 -----------> 0,4 -------> 0,4 (mol)
a) Theo PTHH: nNa2CO3 = nH2SO4 = 0,4 (mol)
=> mNa2CO3 = nNa2CO3. MNa2CO3 = 0,4.106 = 42,4 (g)
=> mdd Na2CO3 = mNa2CO3. 100% : C% = 42,4.100% : 10% = 424 (g)
b) Theo PTHH: nCO2 = nH2SO4 = 0,4 (mol)
=> VCO2(đktc) = 0,4.22,4 = 8,96 (lít)
c) Theo PTHH: nNa2SO4 = nH2SO4 = 0,4 (mol)
=> mNa2SO4 = nNa2SO4. MNa2SO4 = 0,4.142 = 56,8 (g)
mdd A = mdd H2SO4 + mdd Na2CO3 = 400 + 424 = 824 (g)
dd A chứa Na2SO4
=> C% Na2SO4 = (mNa2SO4 : mddA).100% = (56,8 : 824).100% = 6,89%
\(m_{CH_3COOH}=150.12\%=18g\)
\(n_{CH_3COOH}=\dfrac{18}{60}=0,3mol\)
\(2CH_3COOH+Na_2CO_3\rightarrow2CH_3COONa+CO_2+H_2O\)
0,3 0,15 0,3 0,15 ( mol )
\(m_{ddNa_2CO_3}=\left(0,15.106\right):10,6\%=150g\)
\(V_{CO_2}=0,15.22,4=3,36l\)
\(m_{CH_3COONa}=0,3.82=24,6g\)
\(m_{ddspứ}=150+150-0,15.44=293,4g\)
\(C\%_{CH_3COONa}=\dfrac{24,6}{293,4}.100=8,28\%\)