in water byproducts: Na2S2O3, Na2SO3; reaction of aq. Na2S with NaNO3 below 138 °C forming Na2S2O3, NaOH and NH3; further reaction of Na2S2O3 with NaNO3 and NaOH at 152 °C forming Na2SO3 and NH3; reaction of Na2SO3 with NaNO3 at 182 °C froming Na2SO4, NaOH and N2;;
in water byproducts: N2O3; reaction of an acidic aq. soln. of Na2S2O4 with KNO2 on standing on air; at first formation of NaHSO3; then reaction of NaHSO3 forming KNH2SO3, NaOH and NaHSO4; reduction of N2O3 forming N2O;;
