An approximation of the second dissociation constant for H 2 S

Details An approximation of the second dissociation constant for H 2 S An approximation of the second dissociation constant for H 2 S

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..649s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 3, pp.649-654

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Poor resolution G f 0 for S 2- affects hydrothermal complexing arguments, evaluation of sulfide solubility products, and calculation of aqueous sulfur speciation. The second dissociation constant for H 2 S ( log K HS - ) if well known could be used to determine this free-energy. The log K HS - has been evaluated here by extrapolating the thermodynamic data for the dissociation of polysulfides (H 2 S n ) as a function of the reciprocal chain length (1/ n ). The extrapolation method is supported by standard weak acid theory. The extrapolation is further based on flocculation experiments which determined the equilibrium constant for the protonation of a colloidal sulfur surface, which is a reaction analog for the protonation of an infinite sulfur chain, H 2 S . The derived log K HS - value, -18.51 ± 0.56 (20°C), implies that S 2- is never a dominant aqueous species. This new value has been used to derive alternative solubility products of some metal sulfides.

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