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lecture 6 - Announcements Exam 1 topics and chapters...

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Announcements Exam 1 topics and chapters concentration, activity (Chapter 1) thermodynamics (Chapter 2) acids and bases (Chapters 3, 4, and 5) PSs 1, 2, and 3 why take-home? Honor Code open book & notes, closed colleague out Today, Oct 11, 8pm physical copy due Friday, Oct 14, midnight Digitally ONLY eFax OK 678-716-3939
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Part I Open Systems and Alkalinity
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Open System Problems What are the pH and Alk of a 10 -2 M NaHCO 3 solution in equilibrium with CO 2 in the atmosphere? diprotic acid, open system
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Open System Problems pH of pure water in equilibrium with CO 2 in the atmosphere -14 -12 -10 -8 -6 -4 -2 0 0 2 4 6 8 10 12 14 log C pH [H+] [OH-] [H2A] [HA-] [A^2-] [H2A]tot
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-14 -12 -10 -8 -6 -4 -2 0 0 2 4 6 8 10 12 14 log C pH [H+] [OH-] [H2A] [HA-] [A^2-] Open System Problems pH of closed 10 -2 M NaHCO 3 solution
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Open System Problems How does mixture of CO 2 and NaHCO 3 result in a pH higher than NaHCO 3 in the closed system? closed system open system decrease in H 2 CO 3 from 10 -4.0 to 10 -4.94 M decrease in H 2 CO 3 loss of CO 2 to atmosphere loss of CO 2 means increase in pH (8.3 to 9.2) decrease in H 2 CO 3 protonation of HCO 3 - HCO 3 - + H + = H 2 CO 3 removal of H + means increase in pH
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Open System Problems What are the pH and Alk of a 10 -4 M NaHCO 3 solution in equilibrium with CO 2 in the atmosphere? diprotic acid, open system
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Open System Problems pH of pure water in equilibrium with CO 2 in the atmosphere -14 -12 -10 -8 -6 -4 -2 0 0 2 4 6 8 10 12 14 log C pH [H+] [OH-] [H2A] [HA-] [A^2-] [H2A]tot
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