Class Notes Jan 22

Class Notes Jan 22 - 1/22/2010 Announcements: Friday,...

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1/22/2010 1 Announcements: Friday, January 22, 2010 Homework WebAssign #3- Due Wednesday, January 27 at 8:00 AM CLASS Survey Must be completed online by TODAY at 5:00 PM Recitation Week 2- “Equilibrium-Weak and Strong Acids” ** Monday recitation sections- Please attend another session this week! ** Lab Next Week Lab Familiarization and Lab Check-In ** Monday lab sections will check in week 3.** Suggested Textbook Questions Complete Chapter 18 problems. What is the pH for a 1x10 -3 M NaOH(aq) solution at 25ºC? K b (OH - ) >> 1 January 22, 2010 - CT#1 A. 3.0 B. 7.0 D. 14.0 E. Not enough information C. 11.0 OH - is a strong base! Kw = [H 3 O + ][OH - ] = 1x10 -14 [H 3 O + ] = 1x10 -11 & pH = 11.0 BASIC! Relative Acid Strength HA + H 2 O ( l ) A + H 3 O + 1/K a (HB)= [HB] [B ][H 3 O + ] B + H 3 O + HB + H 2 O( ) K a (HA)= [A ][H 3 O + ] [HA] HA + B A + HB Net: Reacting acid Produced acid If K a (HA) > K a (HB), HA is a stronger acid than HB, then K net > 1 and the reaction goes to the right! K net = [A ][HB] [HA][B ] K a (HA) K a (HB) = The stronger acid dissociates and the weaker acid is formed.
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Class Notes Jan 22 - 1/22/2010 Announcements: Friday,...

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