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Water Chem - project2_w_notes

Water Chem - project2_w_notes - naturalsystems.See...

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Ammoniapoisoningisaseriousriskinfreshwateraquariaandinsome naturalsystems.See http://freshaquarium.about.com/cs/disease/p/ammoniapoison.htm Themainequilibriumreactionofammoniainwateris NH 4 + 3 +H K a =10 9.24 (p =9.24) Asolutioncontains2.5x10 MTOT .Plot[NH ]and[NH ]vs.pH. UnderwhatconditionsdoestheNH ( aq )conc’n exceed1mg/L?
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Reaction: Equilibrium:  Static Mass Balance:
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Divide TOT NH 3 Equationby[NH 4 + ]:
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0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 3456789 1 0 2 Fraction as given species pH NH 4 + 3
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UnderwhatconditionsdoestheNH 3 ( aq )conc’n exceed1mg/L?
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4 9.24 3 NH H = 10 TOT      33 1=  Generically:
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0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 3456789 1 0 2 Fraction as given species pH NH 4 + 3 HOCl OCl Ac HAc
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23 3 Reactions: H CO HCO H  2 33 6.3 10.3 12 CO =1 0 = 1 aa KK      32 Mass Balance: CO = H CO TOT    a K Speciation Equilibria:
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23 3 HCO H 2 10.33 CO =1 0 a K    33 
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Water Chem - project2_w_notes - naturalsystems.See...

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