2nd Lecture - Chapter 18 Acid-Base Equilibria Announcements...

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1/16/2008 1 Announcements: Wednesday, January 16, 2008 Homework WebAssign #1- Due Friday , January 18 at 5:00 PM Recitation Print off Week 1- “Chemical Equilibrium” Suggested Textbook Questions Begin Chapter 18 problems. Arrhenius Acid - a substance that has H in its formula and dissociates in water to yield H 3 O + . HBr + H 2 O H 3 O + + Br Arrhenius Base - a substance that has OH in its formula and dissociated in water to yield OH . LiOH Li + + OH Limited to “in water” only! Need broader definitions. Chapter 18- Acid-Base Equilibria Which of the following is/are Arrhenius bases? I. HCl I. NaH I. HCl II. CH 3 OH I. HCl III. NaOH January 16, 2008 - CT#1 A. NaH B. CH 3 OH D. NaH and CH 3 OH E. CH 3 OH and NaOH C. NaOH NaH is a different kind of base but doesn’t contain OH (more later). CH 3 OH doesn’t dissociate to make OH - . NaOH forms OH - in solution. Brønsted-Lowry Acids and Bases Brønsted-Lowry Acid - a substance that can donate a proton (H + ). (Same as Arrhenius definition.) Brønsted-Lowry Base - a substance that can accept a
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