So3 h2so4 s so2 h2so3 nahso3 na2so3

S(+3)O3(-2)

H2(+1)S(+6)O4(-2)

S(0)

S(+4)O2(-2)

H2(+1)S(+4)O3(-2)

Na(+1)H(+1)S(+4)O3(-2)

Na2(+1)S(+4)O3(-2)

SO3 + H2O = H2SO4

H2So4 + 3H2S = 4S + 4H2O

S + O2 = SO2

SO2 + H2O = H2SO3

H2SO3 + x (без понятия) =NaHSO3

NaHSO3 +  NaOH   = Na2SO3 + H2O