Na2SO3 + H2SO4 \(\rightarrow\)Na2SO4 + SO2 + H2O (1)
Ca(OH)2 + SO2 \(\rightarrow\)CaSO3 + H2O (2)
nCa(OH)2=1,4.0,1=0,14(mol)
nNa2SO3=\(\dfrac{12,6}{126}=0,1\left(mol\right)\)
Theo PTHH 1 ta có:
nNa2CO3=nSO2=0,1(mol)
VSO2=0,1.22,4=2,24(lít)
Vì 0,14>0,1 nên Ca(OH)2 dư 0,04mol
Theo PTHH 2 ta có:
nCaSO3=nSO2=0,1(mol)
mCaSO3=120.0,1=12(g)
mCa(OH)2=0,04.74=2,96(g)
mNa2SO4=142.0,1=14,2(g)
nCa2So3=\(\dfrac{m_{ca2so3}}{M_{ca2so3}}=\dfrac{12,6}{126}=0,1mol\)
\(Ca2So3+H2SO4=>Ca2So4+So2\uparrow+H2O\)
0,1...............0,1......................0,1.........0,1
\(n_{Ca\left(OH\right)2}=Cm.V\text{dd}=0,1.1,4=0,14mol\)
\(So2+Ca\left(OH\right)2-->C\text{aS}O3\downarrow+H2O\)
0,14.....0,14.............................0,14........0,14
Va=VSo2=nso2.22,4=0,14.22,4=3,136l
\(m_{C\text{aS}O3\downarrow}=n_{C\text{aS}O3\downarrow}.M_{C\text{aS}O3\downarrow}=0,14.120=16,8g\)