S -> SO2 -> H2SO3 -> Na2SO3
S + O2 = SO2
SO2 + H2O = H2SO3
H2SO3 + Na2O = Na2SO3 + H2O
Ba -> BaO -> Ba(OH)2 -> BaCl2 -> BaCO3
2Ba + O2 = 2BaO
BaO + H2O = Ba(OH)2
Ba(OH)2 + 2HCl = BaCl2 + 2H2O
BaCl2 + Na2CO3 = BaCO3 + 2NaCl
S -> SO2 -> H2SO3 -> Na2SO3
S + O2 = SO2
SO2 + H2O = H2SO3
H2SO3 + Na2O = Na2SO3 + H2O
Ba -> BaO -> Ba(OH)2 -> BaCl2 -> BaCO3
2Ba + O2 = 2BaO
BaO + H2O = Ba(OH)2
Ba(OH)2 + 2HCl = BaCl2 + 2H2O
BaCl2 + Na2CO3 = BaCO3 + 2NaCl