4FeS2+11O2=2Fe2O3+8SO2; 2CaSO4+C=2CaO+2SO2+CO2

Na2SO3+H2SO4=Na2SO4+H2O+SO2, H2SO4+P2O5=SO3

Wł red H2SO3: K2CrO7+3H2SO3+H2SO4=Cr2(SO4)3+K2SO4+4H2O

Wł utl H2SO4: 2H2SO4+C=CO2+2SO2+2H2O, Cu+2H2SO4=CuSO4+SO2+2H2O

Pirosiarczan: 2KHSO4=K2S2O7+H2O, H2S04+SO3=H2S2O7

Wł red S2O3-: Na2S2O3+4Cl2+5H2O=Na2SO4+8HCl+H2SO4

I2+2Na2S2O3=2NaI+Na2S4O6; I2+2H2S2O3+H2O=H2S4O6+2HI

H2S2O7+H2O=2H2SO4, FeS+2HNO3=Fe(NO3)2+H2S

NaOH+H2S=NaHS+H2O

Wielosiarczek: 3Ca(OH)2+12S=2CaS5+CaS2O3+3H2O

AKT w kw: CH3CSNH2+2H2O=CH3COO-+NH4++H2S

AKT w zas: CH3CSNH2+3OH-=CH3COO-+NH3+H2O+S2-

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