(1)FeS+H2===(加热)Fe+H2S
(2)H2S+HgCl2===2HCl+HgS(沉淀)
(3)H2S+NaClO===S+NaCl+H2O
(4)S+Hg===HgS
(5)S+O2===(点燃)SO2
(6)Na2SO3+2HCl===H2O+SO2(气体)+2NaCl
(7)SO2+2NaOH===Na2SO3+H2O(二氧化硫少量 氢氧化钠过量)
(8)S+H2O===(可逆)H2SO3
(9)2SO2+O2===(可逆)2SO3
(10)SO3+H20===H2SO4
(11)H2SO4+Ba(OH)2===BaSO4(沉淀)+2H2O
(12)H2SO4+2NaOH===Na2SO4+2H2O
(13)2Na2SO3+O2===2Na2SO4