Class Notes Jan 25

Class Notes Jan 25 - 1/25/2010 Announcements: Monday,...

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1/25/2010 1 Announcements: Monday, January 25, 2010 Homework WebAssign #3- Due Wednesday, January 27 at 8:00 AM Recitation Week 3- “Complex Ions” Lab 1- Equilibrium Studies 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 25, 2010 - 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 25, 2010 - 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 HCl + H 2 O Cl + H 3 O + HCl: Makes H 3 O + so acidic! Makes neither H 3 O + or OH so neutral! KCl K + + Cl KCl: So HCl makes water acidic but Cl cannot make water basic. HCl is a strong acid and Cl is not a base . Consider what different substances do when you add them to pure water.
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This note was uploaded on 03/23/2010 for the course CHEM 1131 taught by Professor Redin,kend during the Spring '08 term at Colorado.

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Class Notes Jan 25 - 1/25/2010 Announcements: Monday,...

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