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Lecture 6 Chapter 4 et al (Acid-Base)

Lecture 6 Chapter 4 et al (Acid-Base) -...

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Acids and Bases continued  (Chapters 4.4, 18.1-18.3 and  19.2) Lecture 6 September 18, 2009
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Equilibrium constants for weak acids and weak bases: K a and K b Weak Acids: HA (aq) + H 2 O (l)   H 3 O +  (aq) + A -  (aq) K a  = acid dissociation constant  (equilibrium constant for “reaction” of weak acid and  water)
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Weak Bases: B (aq) + H 2 O (l)   BH +  (aq) + OH -  (aq) K b  = base ionization constant  (equilibrium constant for “reaction” of weak base and  water)
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The auto-ionization of water – water reacts with itself
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The weakest of the bases listed is Acid Conjugate Base K a (Ionization Constant of Acid) HI I 100% ionized H 2 SO 3 HSO 3 1.4 x 10 –2 HNO 2 NO 2 - 7.1 x 10 –4 HSO 3 SO 3 2– 6.5 x 10 –8 (A) I (B) HSO 3 (C) NO 2 - (D) SO 3 2–
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The relationship between K a , K b and K W
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The pH scale pH 0 pH 1 pH 2 pH 3 pH 4 pH 5 pH 8 pH 9 pH 10 pH 11 pH 12 pH 13 pH 14 pH 6 pH 7 “Pure” Water Battery Acid
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