2Na+ S $\buildrel{{t^o}}\over\longrightarrow$ Na2S
Na2S+ 2HCl -> 2NaCl+ H2S
2H2S+ SO2 -> 3S+ 2H2O
S+ O2 $\buildrel{{t^o}}\over\longrightarrow$ SO2
2SO2+ O2 $\buildrel{{t^o, V2O5}}\over\rightleftharpoons $2SO3
SO3+ H2O -> H2SO4
NaCl+ H2SO4 -> NaHSO4+ HCl
CuO+ 2HCl -> CuCl2+ H2O
FeS+ 2HCl -> FeCl2+ H2S
H2S+ 3/2 O2 $\buildrel{{t^o}}\over\longrightarrow$ SO2+ H2O
2NaOH+ SO2 -> Na2SO3+ H2O
Na2SO3+ 2HCl -> 2NaCl+ SO2+ H2O
Na2O+ SO2 -> Na2SO3
Na2SO3+ H2SO4 -> Na2SO4+ SO2+ H2O
Na2SO4+ BaCl2 -> BaSO4+ 2NaCl