September 3

September 3 - Lecture #4, September 3, 2008 Acid-base...

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Lecture #4, September 3, 2008 Acid-base chemistry (Chapter 1.13-1,17) Many organic reactions may be considered in the context of acid-base chemistry based on our definitions of acids and bases. Brönsted-Lowry Concept Brönsted acid: H + donor Brönsted base: H + acceptor NH 3 (aq) + CH 3 COOH(aq) NH 4 + (aq) + CH 3 COO (aq) Brönsted acid: CH 3 COO H Brönsted base: NH 3 Conjugate acid: NH 4 + Conjugate base: CH 3 COO Conjugate acid-base concepts Conjugate acid-base pair differs by a proton (H + ) Stronger the acid, weaker the conjugate base ConcepTest (CT) Which pair does not constitute a conjugate acid-base pair? (A) H 3 PO 4 / H 2 PO 4 - (B) H 2 PO 4 - / PO 4 3- (C) HPO 4 2- / PO 4 3- (D) H 2 PO 4 - / HPO 4 2- Relative strengths of acids and bases Using pK a values (Table 1.8) For H 2 O, 15.7 Predicting position of equilibrium Stronger acid + Stronger base Weaker acid + Weaker base Refer to Table of Acidities that you MUST KNOW!
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2 ConcepTest (CT) Predict the magnitude of the equilibrium constant for the reaction:
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This note was uploaded on 02/25/2010 for the course CHEM 3311 at Colorado.

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September 3 - Lecture #4, September 3, 2008 Acid-base...

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