Hydrogen sulphide ionization and sulphur hydrolysis in high temperature solution

Details Hydrogen sulphide ionization and sulphur hydrolysis in high temperature solution Hydrogen sulphide ionization and sulphur hydrolysis in high temperature solution

Mar 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35..247e&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 35, Issue 3, pp.247-260

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6

Scientific paper

Spectrophotometric measurements up to 270° of aqueous H 2 S solutions, and of strongly alkaline sulphide solutions, were used to evaluate K 1 and K 2 the first and second ionization constants for H 2 S. Values of pK 1 decrease from 7.0 at room temperature to a minimum of 6.6 at 100° and rise again to 7.8 at 270°. pK 2 is shown to be much higher than previous estimates, and almost outside the range of measurement. It is at 25°, >17; at 100°, >16; at 200°, > 12.5; and at 300°, > 12. The hydrolysis of sulphur to H 2 S and H 2 SO 4 was studied to 350° and quantitative data are reported. At high temperatures the stability of sulphur is limited to high acidities and a narrow range of p O 2 values. The relevance of sulphur hydrolysis to the formation of natural high temperature acid hydrothermal systems is pointed out.

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