lec 8 - Organic Lecture Series CH 310/318 M LECTURE 8...

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Organic Lecture Series 1 CH 310/318 M LECTURE 8 Textbook Assignment: Chapter 4 Today’s Topics: Acids & Bases Acids & Bases Notice & Announcements: Exam1: Wednesday 7-9 PM A-L: WEL 3.502, M-Z: WEL 1.316 (No HW this week) Organic Lecture Series 2 Acids and Bases Acids and Bases Chapter 4 Chapter 4
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Organic Lecture Series 3 Arrhenius Acids and Bases Arrhenius Acids and Bases • In 1884, Svante Arrhenius proposed these definitions acid: acid: A substance that produces H 3 O + ions aqueous solution. base: base: A substance that produces OH - ions in aqueous solution. – this definition of an acid is a slight modification of the original Arrhenius definition, which was that an acid is a substance that produces H + in aqueous solution. – today we know that H + reacts immediately with a water molecule to give a hydronium ion. H + + H 2 O(l) H 3 O + (aq) Hydronium ion Organic Lecture Series 4 Br Br ønsted nsted -Lowry Definitions Lowry Definitions Acid: Acid: proton donor. Base: Base:proton acceptor.
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Organic Lecture Series 5 Conjugate Acids & Bases Conjugate Acids & Bases Conjugate base Conjugate base : The species formed from an acid when it donates a proton to a base. Conjugate acid: Conjugate acid: The species formed from a base when it accepts a proton from an acid. Acid Acid -base reaction base reaction : A proton-transfer reaction. Conjugate acid Conjugate acid -base pair base pair : Any pair of molecules or ions that can be interconverted by transfer of a proton. HCl( aq )H 2 O(l) Cl - ( ) H 3 O + ( ) + + Water Hydrogen chloride Hydronium ion Chloride ion (base) (acid) (conjugate acid of H 2 O) (conjugate base of HCl) conjugate acid-base pair conjugate acid-base pair Organic Lecture Series 6 – Brønsted-Lowry definitions do not require water as a reactant. – Consider the following reaction between acetic acid and ammonia. NH 4 + CH 3 COOH 3 COO - 3 + + Acetic acid Ammonia (acid) conjugate acid-base pair Acetate ion Ammonium ion (base) (conjugate base acetic acid) (conjugate acid of ammonia) conjugate acid-base pair Conjugate Acids & Bases Conjugate Acids & Bases
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Organic Lecture Series 7
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This note was uploaded on 10/20/2011 for the course CH 310 M taught by Professor Iverson during the Fall '09 term at University of Texas.

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lec 8 - Organic Lecture Series CH 310/318 M LECTURE 8...

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