Recitation-11 - Chemistry 111 Chemistry 111 Recitation 11...

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Chemistry 111 Chemistry 111 Recitation # 11 – Acids and Bases November 29, 2005 Aqueous solutions Æ formation of ions by substances dissolved in water Æ net ionic equations and spectator ions Acids and Bases Æ Arrhenius definition Æ Bronsted-Lowry definition Æ Lewis definition Reactions of Acids and Bases with water Æ conjugate acid-base pairs Æ amphoteric species Æ autoionization of water; K w = [H 3 O + ] [OH - ] = 1.00 x 10 -14 (25 o C) Acid and Base Strengths Æ ionization and acid/base strength Æ strong acids Æ predicting (relative) acid strengths ( R – X – H ) using the electronegativity of X and the size of X stronger acids have a weaker X – H bond Quantifying Acid and Base Strength Æ K a and K b Æ leveling effect of water Æ relative strengths of conjugate bases Reactions Between Acids and Bases in water Æ predicting the position of equilibrium pH = - log [H 3 O + ] pOH = - log [OH - ] pK a = - log K a pK b = - log K b ... coming up … acid/base equilibrium problems, buffers and titrations!
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