3rd Lecture

# 3rd Lecture - Announcements Wednesday Homework WebAssign#3...

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1/23/2008 1 Announcements: Wednesday, January 23, 2008 Homework WebAssign #3- Due Wednesday, January 30 at 8:00 AM CLASS Survey Must be completed online by Friday 1/25 at 5:00 PM Recitation Print Week 2- “Equilibrium - Weak and Strong Acids” ** Monday recitation sections- Please attend another session this week! ** Suggested Textbook Questions Continue Chapter 18 problems. What is the pH of a 1x10 -4 M HI(aq) solution? (K a (HI) >> 1) January 23, 2008 - CT#1 A. 7 B. 10 D. 14 E. Not enough information C. 4 HI dissociates completely! [H 3 O + ] = 1x10 -4 M pH = 4 Acidic! What is the pH of a 1x10 -9 M H 2 SO 4 (aq) solution? (K a (H 2 SO 4 ) >> 1) January 23, 2008 - CT#2 B. 9 C. 5 D. 14 E. Not enough information A. 7 H 2 SO 4 dissociates completely! [H 3 O + ] = 1x10 -9 M pH = 9 Basic! No way! H 2 SO 4 (aq) + H 2 O( l ) HSO 4 - (aq) + H 3 O + (aq) 10 -9 0 10 -7 Must consider the contribution from water! -10 -9 +10 -9 +10 -9 0 10 -9 1.01x10 -7 pH = 7.0 I C E Another assumption Usually the contribution from water is too small to make a difference.

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