in neat (no solvent) heating a mixt. of As2O3 and NaNO3 on air; clacination after 6-9 h for 12-18 h;; crystalline product impured by As2O3;;

in water byproducts: NaNO3; with 2.75n HNO3, exothermic react.;;

byproducts: H2O; loss of 1 mol H2O on heating to 100-130°C;;

in water on potentiometric titration of a 0.05m H3AsO4-soln. with 0.2n NaOH;; in aq. soln.;;

byproducts: H;

sulfuric acid in not given mixing concd. soln. of NaH2AsO4 and Na2S2O3 (molecular ratio 1:1) there is pptn. of As and from filtrate pptn. of As2S2, mother layer ppts. after concentration over H2SO4 Na2SO3;;

in water mixing concd. solns. of NaH2AsO4 and Na2S2O3 (molecular ratio 1:1), there is first pptn. of As and from filtrate pptn. of As2S2, mother layer ppts. after concentration on water bath yellow material, which changes to small red plates;; removal of Na2SO3 via washing with alcohol, constitution: Na8As18O7S24*30H2O;;

sulfuric acid in water exothermic react.;;

in water byproducts: NaNO3; endothermic react.;;