L28-Chemical_Dynamics

L28-Chemical_Dynamics - Brnsted-Lowry Acids and Bases Part...

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Part IV: Chemical Dynamics Chemical Equilibria: Weak Acids (Last Lecture of the Semester, WOO HOO!!) 1 Brønsted-Lowry Acids and Bases Acid: a proton donor Base: a proton acceptor does not have to have hydroxide ion (OH) as part of the molecule lone pair of electrons has to be present 2 H Acid Strength: Strong v. Weak Strong acids ionize completely in dilute solution Cl H Cl Cl H Cl H Cl H H Cl 3 Acid Strength: Strong v. Weak Weak acids do not ionize completely in dilute solution H F H F H F H F H F H F 4
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HCl + H 2 O ! H 3 O + + Cl " HF + H 2 O ! H 3 O + + F ! Acid Strength: Strong v. Weak Acidic protons combine with water to form the hydronium ion ! very few strong acids exist ! most acids are weak acids 5 Acid Strength: Weak v. Weaker Not all weak acids are weak to the same degree Weak Acid Degree of Ionization in H 2 O HF 1 in ~1,400 CH 3 COOH 1 in ~55,600 HCN 1 in ~ 2,500,000 ! HF is the stronger weak acid of the three • a larger fraction of the molecules ionizes 6 K c = H 3 O + ! " # $ F
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This note was uploaded on 09/24/2009 for the course CHEM 333 taught by Professor Baird during the Spring '09 term at UC Davis.

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L28-Chemical_Dynamics - Brnsted-Lowry Acids and Bases Part...

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