The Σ S lines correspond to the indicated levels of total sulfur in solution. The A branch of these lines corresponds to. The redox region where Σ S = H2S + HS. At pH 7 these species are approximately equal (reaction 26 table 17.2), so the indicated. H2S activity is approximately half the total sulfur. The B branch of these lines corresponds to the redox region where SO4. Is stable or Σ, S = SO4. The equilibrium reaction used to construct the B line is.
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