MWF_10 - Organic Lecture Series CH 310/318 M Textbook...

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Organic Lecture Series 1 CH 310/318 M LECTURE 10 Textbook Assignment: Chapter 4 Today’s Topics: Acid Base Chemistry Acid Base Chemistry -Introduction; Introduction; pKa pKa Notice & Announcements: Problem Set 3 posted- Organic Lecture Series 2 Acids and Acids and Bases 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
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MWF_10 - Organic Lecture Series CH 310/318 M Textbook...

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