5th Lecture

5th Lecture - Announcements Monday Homework WebAssign#3 Due Wednesday January 30 at 8:00 AM Recitation Print Week 3"Acid/Base Properties Lab

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1/28/2008 1 Announcements: Monday, January 28, 2008 Homework WebAssign #3- Due Wednesday, January 30 at 8:00 AM Recitation Print Week 3- “Acid/Base Properties” Lab- Buffers Complete prelab prior to recitation. Suggested Textbook Questions Begin Chapter 19 problems. What is the pK a1 for ascorbic acid if its K a1 = 1.0 x 10 -5 ? January 28, 2008 - CT#1 A. >>1 C. 7 D. 9 E. 14 B. 5 pK a1 = -log(K a1 ) pK a1 = -log(1.0 x 10 -5 ) pK a1 = 5 What is the K b of sodium phenoxide? (pK a phenol = 10) January 28, 2008 - CT#2 A. 10 B. 4 C. 1 x 10 -10 E. >>1 D. 1 x 10 -4 Sodium phenoxide (NaC 6 H 5 O) is the sodium salt of the conjugate base of phenol (C 6 H 5 OH). K a x K b = 10 -14 pK a + pK b = 14 pK b = 14 pK a So, pK b = 14 - 10 = 4 K b = 10 -4 Types of Solutions So Far Strong Acid Strong Base Weak Acid Weak Base - Dissociates 100% to make H 3 O + and an anion. - Dissociates 100% to make OH - and a cation. - Dissociates according to K a to make H 3 O + and the weak conjugate base. - Dissociates according to K b make OH - and the weak conjugate acid.
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This note was uploaded on 03/02/2008 for the course CHEM 1131 taught by Professor Redin,kend during the Spring '08 term at Colorado.

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5th Lecture - Announcements Monday Homework WebAssign#3 Due Wednesday January 30 at 8:00 AM Recitation Print Week 3"Acid/Base Properties Lab

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