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Chapter-16 - CHAPTER 16 ACID BASE EQUILIBRIA weak acids and...

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1 CHAPTER 16 ACID - BASE EQUILIBRIA • weak acids and bases • self-ionization of water, pH • pH of weak acid/base solutions • pH of salt solutions
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2 a weak acid is partially ionized AH + H 2 O A - + H 3 O + K a = [A - ][H 3 O + ]/[AH] acid ionization constant K a measures acid strength: K a [H 3 O + ] acidity AH, A - = conjugate acid-base pair Weak acids and bases
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3 a weak base is partially ionized : B + H 2 O BH + + OH - K b = [BH + ][OH - ]/[B] base ionization constant K b measures base strength: K b [OH - ] basicity BH + , B = conjugate acid-base pair
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4 recall pK = -log K
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5 strength of oxoacids hypochlorous acid HOCl K a = 2.9 10 -8 chlorous acid HClO 2 K a = 1.1 10 -2 perchloric acid HClO 4 K a = ? - +
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6 acetic acid CH 3 COOH K a = 1.8 10 -5 chloracetic acid CH 2 ClCOOH K a = 1.4 10 -3 acidic H
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7 Why isn’t NaOH acidic ??
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8 strength of conjugate acid-base pair acid strength base strength (and vice versa) HCl + H 2 O Cl - + H 3 O + not basic strong acid CH 3 COOH + H 2 O CH 3 COO - + H 3 O + weak acid weak base
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9 Conjugate acid-base pairs
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Chapter-16 - CHAPTER 16 ACID BASE EQUILIBRIA weak acids and...

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