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CH 3-2: Acid/Base equilibrium; pKa’s
What is “pKa”? pKa = -log Ka ??? ??? acid base conj. base conj. acid Let’s think of the pKa as an acid’s “affinity” for protons….. pKa range < strong acid…………..weak acid Ka range strong acid weak acid
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Characterizing acid strength: pKa scale (0 – 35)
pKa < 2…….....strong acid (“inorganic acids”) pka ~ 5…...…..moderate acid (carboxylic acids) pKa 7 – 16……weak acids (ammonium ion, alcohols, water) pKa 25 – 35…..very weak acids (ammonia, amines, alkynes) pKa > 35……....little ionization in water (alkenes, alkanes)
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![Weak Acids A weak acid does not ionize completely to form hydrogen ions. e.g.HC 2 H 3 O 2 (aq ) H + (aq) + C 2 H 3 O 2 - (aq) 1.3% K a = [H + (aq) ] [H.](/8/2410207/big_thumb.jpg "Weak Acids A weak acid does not ionize completely to form hydrogen ions. e.g.HC 2 H 3 O 2 (aq ) H + (aq) + C 2 H 3 O 2 - (aq) 1.3% K a = [H + (aq) ] [H.>")
