How arsenic trichloride (AsCl3) can form from As2O3 ?
I think that Pourbaix diagram is useful to reply at this question.
Where can I find arsenic Pourbaix diagram ?
Many thnaks
Dear Richard,
As As2O3 are soluble in dilute acid. You may try As2O3 with dilute HCl to form AsCl3.
https://materialsproject.org/ has free tools for making pourbaix diagrams based on the elements you are working with
I’m having the same problem also... I tried using 6M and 12 M HCl to dissolve just one gram of it and the As2O3 isn’t dissolving....is heat required for this reaction or is more HCl required?
I. ― AsCl3 can be prepared from As2O3 and (excess) SOCl2 (both reactant and solvent): As2O3 + 3 SOCl2 → 2 AsCl3 + 3 SO2.
Cf.: H.B. North, A.M. Hageman, J. Am. Chem. Soc. 35, 1913, 352-356; S.K. Pandey, A. Steiner, H.W. Roesky, Inorg. Synth. 31, 1997, 148-150.
II. ― It can be also prepared from reaction of As2O3 with S2Cl2: 2 As2O3 + 6 S2Cl2 → 4 AsCl3 + 3 SO2 + 9 S.
Cf.: R.C. Smith, "Manufacture of arsenic trichloride", Ind. Eng. Chem., 11(2), 1919, 109-110.
III. ― It can be further prepared from reaction of As2O3 with S2Cl2 and dry Cl2: 4 As2O3 + 3 S2Cl2 + 9 Cl2 → 8 AsCl3 + 6 SO2.
Cf.: W. Blitz, A. Sapper, "Über Molekular‐ und Atomvolumina. 34. Tieftemperaturdichten einiger Halogenide von Elementen der vierten bis sechsten Gruppe", Zeitschrift für anorganische und allgemeine Chemie, 203(1) 1931, 277-306.
IV. ― Furthermore, it can be obtained by reactive distillation of As2O3 from boiling conc. HCl aq. under bubbling HCl gas stream: As2O3 + 6 HCl → 2 AsCl3 + 3 H2O.
Cf.: C.F. Booth (Monsanto), "Process for making arsenic chloride", US Patent 2,383,105, Aug. 21, 1945.
The Pourbaix diagram of arsenium can be found at (e.g.):
A. Sarkar, B. Paul, "The global menace of arsenic and its conventional remediation ― A critical review", Chemosphere, 158, 2016, 37-49.
A.H. Welch, M.S. Lico, J.L. Hughes, "Arsenic in groundwater of the western United States", Groundwater, 26(3) 1988, 333-347.
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