Gọi nNaHCO3 =a mol, nNa2CO3=b mol
theo đề bài mNaHCO3=mNa2CO3 <=>a*84=b*106
Bảo toàn nguyen tố C=> nCO2=0,15=nNaHCO3+ nNa2CO3<=>a+b=0,15
=>a=0,084mol
b=0,066 mol
=>nNa=nNaOH=nNaHCO3 + 2nNa2CO3=a+2b=.... =>CNaOH=...
\(n_{NaOH\left(1\right)}=x;n_{NaOH\left(2\right)}=y\\ PTHH:2NaOH+CO_2\rightarrow Na_2CO_3+H_2O\\ PTHH:NaOH+CO_2\rightarrow NaHCO_3\\ hpt:\left\{{}\begin{matrix}\left(x+y\right)22,4=3,36\\\frac{106.x}{2}=84y\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,09\\y=0,06\end{matrix}\right.\Rightarrow2x+y=0,24\\ C_M=\frac{0,24}{0,5}=0,48\left(M\right)\)
Đặt :
nNa2CO3 = x mol
nNaHCO3 = y mol
nCO2 = 3.36/22.4 = 0.15 mol
2NaOH + CO2 --> Na2CO3 + H2O
2x________x_______x
NaOH + CO2 --> NaHCO3
y_______y________y
<=> x + y = 0.15 (1)
TC : 106x = 84y => 106x - 84y = 0 (2)
Giải (1) và (2) :
x = 63/950
y = 159/1900
CM NaOH = [(2*63/950) + 159/1900]/0.5 = 0.44M
Đặt :
nNa2CO3 = x mol
nNaHCO3 = y mol
nCO2 = 3.36/22.4 = 0.15 mol
2NaOH + CO2 --> Na2CO3 + H2O
2x________x_______x
NaOH + CO2 --> NaHCO3
y_______y________y
<=> x + y = 0.15 (1)
TC : 106x = 84y => 106x - 84y = 0 (2)
Giải (1) và (2) :
x = 63/950
y = 159/1900
VCO2 = [(2*63/950) + 159/1900]*22.4 = 9.3 (l)