I have two bottles of NaOH 10% solution in the gas trap system to keep the gases after the tube furnace. What are the real reactions?
Of course a neutralization reaction will occur between both sulfurous acid (resulted from the reaction between SO2 gas and water) and sulfuric acid (resulted from the reaction between SO3 gas and water) with NaOH. In addition, a direct reaction between SO2 and SO3 gases with NaOH may be also be occurred to give a same products because those gases having acidic characteristics.
Of course a neutralization reaction will occur between both sulfurous acid (resulted from the reaction between SO2 gas and water) and sulfuric acid (resulted from the reaction between SO3 gas and water) with NaOH. In addition, a direct reaction between SO2 and SO3 gases with NaOH may be also be occurred to give a same products because those gases having acidic characteristics.
The reaction will first take place to produce Na2SO3. After the saturatioon of NaOH, the additional SO3 absorved will convert to Na HSO3 ( Na2SO3+ SO2+2O wil render 2(NaHSO3)
sorry typing mistake instead of O2 I mean H2O. The oxidation of SO2 to SO3 is made in gas phase in a catalytic reaction. I dont know if you can convert Na2So3 to Na2SO4 in solution.
Normally in cumbustion work you would be doing this in an oxygen environment. You can then convert the trapped SO3 to SO4 2- with the addition of a small amount of hydrogen peroxide (normally 50%) in the NaOH trap solution. We originally did this work in carbonate -bicarbonate matrix to allow for analysis by IC but I have done this as well with NaOH and the newer KOH IC systems. See older papers. DETERMINATION OF SULPHUR AT LOW LEVELS IN STANDARD REFERENCE MATERIALS BY PYROHYDROLYSIS/LON CHROMATOGRAPHY Gwendy E.M. HALL, Judy A. VAIVE, Geostandards and Geoanalytical Research 01/1989; 13(1):1 - 4 and The analysis of geological materials for fluorine, chlorine and sulphur using pyrohydrolysis and ion chromatography G.E.M. Hall, A.I. MacLaurin, J. Vaive Journal of Geochemical Exploration 01/1986; 26(2):177-186
Both SO2 and SO3 are acidic oxides and they react with bases in aqueous solutions to form the salts of sulfurous acid and sulfuric acid as these gases dissolve in aqueous solutions to form sulfurous acid and sulfuric acid. Thus SO2 and SO3 will form Na2SO3 and Na2SO4 with NaOH in aqueous solution.
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