Chapter 2 Acids and Bases.pptx - Two Theories of Acids and...

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Two Theories of Acids and Bases Arrhenius: Acids contain the H + ion, Bases the OH- ion Bronsted-Lowry: …
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Specific Example:
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Acid-Base Conjugates (pairs) Differ by a single proton Appear on opposite sides of an equilibrium reaction Must exist in conjunction with each other Identify the acid-base conjugates
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Strong vs. Weak Acids Strong Acids: Weak Acids:
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A strong acid readily donates a proton, forming a weak conjugate base. A strong base readily accepts a proton, forming a weak conjugate acid. In other words: “ The stronger the acid, the weaker its conjugate base”
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pKa = -LogKa Acid p K a Conjugate base H—Cl –7 Cl CH 3 COO—H 4.8 CH 3 COO HO—H 15.7 HO CH 3 CH 2 O—H 16 CH 3 CH 2 O HC≡≡CH 25 HC≡≡C H—H 35 H H 2 N—H 38 H 2 N CH 2 = CH 2 44 CH 3 —H 50 CH 3 The smaller the Ka the weaker the Acid The smaller the pKa the STRONGER the Acid
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Big deal, what’s the point of all this K a stuff?
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