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Water Chem - project2_w_notes

Water Chem - project2_w_notes - naturalsystems.See...

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Ammonia poisoning is a serious risk in freshwater aquaria and in some natural systems. See http://freshaquarium.about.com/cs/disease/p/ammoniapoison.htm The main equilibrium reaction of ammonia in water is NH 4 + NH 3 + H + K a = 10 9.24 (p K a = 9.24) A solution contains 2.5x10 4 M TOT NH 3 . Plot [NH 3 ] and [NH 4 + ] vs. pH. Under what conditions does the NH 3 ( aq ) conc’n exceed 1 mg/L?
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Reaction: Equilibrium: Static Mass Balance:
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Divide TOT NH 3 Equation by [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 3 4 5 6 7 8 9 10 11 12 Fraction as given species pH NH 4 + NH 3
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Under what conditions does the NH 3 ( aq ) conc’n exceed 1 mg/L?
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4 9.24 3 NH H = NH 10 H TOT 9.24 4 3 9.24 3 3 NH NH 10 1 = NH NH 10 H TOT TOT Generically:
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