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Unformatted text preview: Che 131 Notes Chapter 16: Acids and Bases Lecture 36: pH; Br nsted-Lowry Acids & Bases Reading: 16.1-16.2, 16.6 I. 16.1 The Brnsted-Lowry Concept of Acids and Bases A. Brnsted Lowry acids are hydrogen ion donors B. Brnsted Lowry bases are hydrogen ion acceptors 1. a molecule or ion must have an unshared pair of electrons C. Acid-base reactions : acids donate H + ions, and bases accept them D. Waters Role as Acid or Base 1. In aqueous solution, all Brnsted-Lowry acids and bases react with water molecules a. A water molecule accepts an H + from an acid, donates to a base 2. amphiprotic : a substance that can donate or accept H + (like H 2 O) E. Conjugate Acid-Base Pairs: a pair of molecules or ions related to each other by the loss or gain of a single H + 1. whenever an acid donates H + to a base, a new acid and a new base are formed a. i.e. Acetic acid is an H + ion donor (an acid), water is an H + ion acceptor (a base) i. the products of the reaction are a new acid, H 3 O + , and a new base CH 3 COO- ii. in the reverse reaction, H 3 O + acts as an acid (donor), and acetate ion as a base 2. every Brnsted-Lowry acid has its conjugate base, and every base has its acid a. removing an H + ion from the acid and making the charge of the remaining portion...
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