Đổi 112ml = 0,112 lít, 700ml = 0,7 lít.
Ta có: \(n_{SO_2}=\dfrac{0,112}{22,4}=0,005\left(mol\right)\)
a. PTHH: SO2 + Ca(OH)2 ---> CaSO3↓ + H2O
Theo PT: \(n_{CaSO_3}=n_{SO_2}=0,005\left(mol\right)\)
=> \(m_{CaSO_3}=0,005.120=0,6\left(g\right)\)
b. Theo PT: \(n_{Ca\left(OH\right)_2}=n_{SO_2}=0,005\left(mol\right)\)
=> \(C_{M_{Ca\left(OH\right)_2}}=\dfrac{n_{ct}}{V_{dd}}=\dfrac{0,005}{0,7}\approx0,007\left(M\right)\)