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\(Na_2CO_3+2HCl\rightarrow NaCl+CO_2+H_2O\\ n_{Na_2CO_3}=\dfrac{1}{2}n_{HCl}=\dfrac{1}{2}.\dfrac{136,875.8\%}{36,5}=0,15\left(mol\right)\\ m_{ddNa_2CO_3}=\dfrac{0,15.106}{20\%}=79,5\left(g\right)\)
a)
\(n_{CO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: Na2CO3 + 2CH3COOH --> 2CH3COONa + CO2 + H2O
0,15<---------0,3<------------------------0,15
=> \(C\%_{dd.CH_3COOH}=\dfrac{0,3.60}{200}.100\%=9\%\)
b)
\(m_{dd.Na_2CO_3}=\dfrac{0,15.106.100}{15}=106\left(g\right)\)
c)
PTHH: 2CH3COOH + Ba(OH)2 --> (CH3COO)2Ba + 2H2O
0,3--------->0,15
=> \(V_{dd.Ba\left(OH\right)_2}=\dfrac{0,15}{0,5}=0,3\left(l\right)=300\left(ml\right)\)
CaCO3 + 2 CH3COOH -> (CH3COO)Ca + CO2 + H2O
b) nCaCO3=0,1(mol)
=> nCH3COOH = 0,2(mol)
=> mCH3COOH= 0,2. 60=12(g)
=> mddCH3COOH=(12.100)/12=100(g)
PTHH: \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
Ta có: \(n_{NaOH}=\dfrac{30\cdot20\%}{40}=0,15\left(mol\right)=n_{CH_3COONa}=n_{CH_3COOH}\)
\(\Rightarrow\left\{{}\begin{matrix}m_{CH_3COONa}=0,15\cdot82=12,3\left(g\right)\\C_{M_{CH_3COOH}}=\dfrac{0,15}{0,5}=0,3\left(M\right)\end{matrix}\right.\)
\(200ml=0,2l\\ n_{Na_2CO_3}=0,5.0,2=0,1\left(mol\right)\\ PTHH:Na_2CO_3+2HCl\rightarrow2NaCl+CO_2\uparrow+H_2O\\ \left(mol\right)........0,1\rightarrow...0,2.......0,2..........0,1.........0,1\\ a,C_{M_{HCl}}=\dfrac{0,2}{0,2}=1\left(M\right)\\ b,m_{NaCl}=0,2.58,5=11,7\left(g\right)\\c, V_{ddNaCl}=V_{ddNa_2CO_3}+V_{ddHCl}=0,2+0,2=0,4\left(l\right)\\ C_{M_{NaCl}}=\dfrac{0,2}{0,4}=0,5\left(M\right)\)
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
\(n_{CH_3COOH}=\dfrac{50.12\%}{60}=0,1mol\)
\(2CH_3COOH+Na_2CO_3\rightarrow2CH_3COONa+CO_2+H_2O\)
0,1 0,05 ( mol )
\(m_{Na_2CO_3}=0,05.106=5,3g\)
\(m_{dd_{Na_2CO_3}}=\dfrac{5,3}{8,4\%}=63,09g\)
\(m_{CH_3COOH}=\dfrac{12.50}{100}=6\left(g\right)\\ \rightarrow n_{CH_3COOH}=\dfrac{6}{60}=0,1\left(mol\right)\)
PTHH: 2CH3COOH + Na2CO3 ---> 2CH3COONa + CO2 + H2O
0,1------------>0,05
=> \(m_{ddNa_2CO_3}=\dfrac{0,05.106}{8,4\%}=63,1\left(g\right)\)