c103-sp10-0414

c103-sp10-0414 - Chemistry 103 Spring 2010 Today 1....

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Chemistry 103 Spring 2010 Today 1. Conjugates and salts as acids and bases. 2. Molecular structure and acid strength. Announcements 1. Ch. 15 OWL homework is active. 2. First midterm exam on Apr. 21. Chapter 14 (not 14.4-14.5, reverse osmosis) Chapter 15 (15.6 oxoacids only, not 15.9) 3. CSULA closure on May 21 (furlough). 4. CSULA closure on May 31 (holiday). 5. Bring textbook and calculator to each lecture.
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Chemistry 103 Spring 2010 2 Correction % ionization = amount ionized x 100% amount initial (total) % ionization for 0.100 M CH 3 COOH = 1.34 M x 10 -3 / 0.100 M x 100% = 1.34% (also known as % dissociation) Review Acids (HA) : HCl, HCN, etc.; -COOH (carboxylic acids); H 2 O, H 3 O + , NH 4 + , HCO 3 - , … anything with an H + to donate. Bases (B) : hydroxides (OH - ); -NH 2 and variations (amines, e.g., CH 3 NH 2 , (CH 3 ) 3 N, etc.); H 2 O, OCl - , CH 3 COO - , … anything that can accept an H + .
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Chemistry 103 Spring 2010 3 Conjugates and salts as acids and bases (p. 561 and Ch. 15.8) HOCl acid : HOCl + H 2 O(l) H 3 O + + OCl - K a = [H 3 O + ][OCl - ] / [HOCl] = 3.5 x 10 -8 (p. 554) OCl - conjugate base : OCl - + H 2 O(l) HOCl + OH - K b = [HOCl][OH - ] / [OCl - ] = 2.9 x 10 -7 (p. 554) K a x K b = [H 3 O + ][OCl - ] x [HOCl][OH -
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c103-sp10-0414 - Chemistry 103 Spring 2010 Today 1....

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