ch02 - Water Water and Buffers Chapter 2 1 Unusual...

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1 Water and Buffers Chapter 2 1. Unusual properties of water 2. Acids and Bases 3. Buffers 2-1 Water 2-3,4 Dissolution of salts (2-6) F = Q 1 Q 2 ε r 2 Q = magnitude of charges r = distance between charges ε = dielectric constant ε Water 78.5 Benzene 4.6 2-7 amphipathic Hydrophobic interaction
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2 11-4 l 2-12 Colligative properties Weak acid releases H + = proton donor Weak base binds H + = proton acceptor Weak acids and bases exist in reversible equilibrium as conjugate pairs in aqueous solution due to their tendency to dissociate: law of mass action says: HA H + + A - (dissociation reaction) HA = weak acid; A - = conjugate base equilibrium constant, K eq = [ H + ][ A ] [ HA ] = K dn (dissociation constant) Acids, Bases, pH Note: your book refers to the dissociation constant for an acid ionization reaction as K a . I will use K dn for dissociation, and K an for association, whatever the reaction. Titration of weak acid with base: 2 reversible equilibria (e.g.
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