lecture 6

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

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Unformatted text preview: 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 Part I Open Systems and Alkalinity 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 Open System Problems pH of pure water in equilibrium with CO 2 in the atmosphere -14-12-10-8-6-4-2 2 4 6 8 10 12 14 log C pH [H+] [OH-] [H2A] [HA-] [A^2-] [H2A]tot-14-12-10-8-6-4-2 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 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 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?...
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This note was uploaded on 11/10/2011 for the course STAT 601 taught by Professor Reik during the Spring '11 term at UAA.

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

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