Ta có: \(\left\{{}\begin{matrix}n_{CO_2}=\dfrac{0,308}{44}=0,007\left(mol\right)\\n_{Ca\left(OH\right)_2}=2\cdot0,002=0,004\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Tạo 2 muối
PTHH: \(2CO_2+Ca\left(OH\right)_2\rightarrow Ca\left(HCO_3\right)_2\)
2a______a____________a (mol)
\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3\downarrow+H_2O\)
b_______b_________b (mol)
Ta lập được HPT: \(\left\{{}\begin{matrix}2a+b=0,007\\a+b=0,002\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=n_{Ca\left(HCO_3\right)_2}=0,003\left(mol\right)\\b=n_{CaCO_3}=0,001\left(mol\right)\end{matrix}\right.\)
PTHH: \(Ca\left(HCO_3\right)_2+2NaOH\rightarrow CaCO_3\downarrow+Na_2CO_3+2H_2O\)
Ta có: \(n_{NaOH}=\dfrac{5\cdot4\%}{40}=0,005\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,003}{1}>\dfrac{0,005}{2}\) \(\Rightarrow\) Ca(HCO3)2 còn dư
\(\Rightarrow\left\{{}\begin{matrix}n_{Na_2CO_3}=0,0025\left(mol\right)\\n_{Ca\left(HCO_3\right)_2\left(dư\right)}=0,0005\left(mol\right)\\\Sigma n_{CaCO_3}=0,001+0,0025=0,0035\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Na_2CO_3}=0,0025\cdot106=0,265\left(g\right)\\m_{Ca\left(HCO_3\right)_2}=0,0005\cdot162=0,081\left(g\right)\\m_{CaCO_3}=0,0035\cdot100=0,35\left(g\right)\end{matrix}\right.\)
