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The following describes a simplified aqueous system where H2S from bacterial activity is dissolved in the water to produce a total concentration of [HS]
The following describes a simplified aqueous system where H2S from bacterial activity is dissolved in the water to produce a total concentration of [HS] = 1103 M. The system is assumed to have reached equilibrium at standard state (P = 1 atm, T = 25 C). So the recipe is [H2S] = 1.103 M and pure water. The species in the system are therefore: (H2O), H, OH, H2S, HS, S- (a) Write the reaction equations relevant for water and the sulfide system describing the system. For the sulfide system please use pK1 = 7.02 and pK2 = 13.9. (b) Construct a tableau for the system. (c) Write all the mole balance equations (satisfying the tableau) and the mass law equations for the problem as defined by the tableau. (d) Verify that the mole balance equations satisfy the condition of electro-neutrality (charge balance). (e) Sketch a graphical solution in a log C vs. pH diagram. (f) Using the mole balance and mass law equations defined by the Tableau to derive an algebraic solution. Justifiable approximations should be used. Calculate pH and the concentration of all species. Verify your assumptions.
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