Aqueous species in mixed solution?

Question

Say a solution is made of Na2SO4 and H2S. What are possible aqueous species that might be present (species can be separate & not necessarily be present at the same time). Can any of the species be considered for thermodynamic purposes.

Answer 1

Sodium sulphate (as an ionic solid) will be completely dissociated to give Na+(aq) and (SO4)2-(aq)

H2S as a weak acid will only be partly ionised into H3O+(aq), HS-(aq) and S2-(aq), leaving plenty of H2S(aq) undissociated.

There will possibly be a very small amount of (HSO4)-(aq) as well.

And also a very small amount of OH-(aq) from the water.