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Chem_215_week05_acid-base_equilibrium-Summer_2011

Chem_215_week05_acid-base_equilibrium-Summer_2011 -...

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Acid/Base Equilibrium 4.4: Acid-base reactions 12.5: The uniqueness of water 18.1: Acids and bases in water 18.2: Autoionization of water and the pH scale 18.3: Proton transfer and the Brønsted-Lowry acid-base definition 18.4: Solving problems involving weak-acid equilibria 18.5: Weak bases and their relation to weak acids 19.1: Equilibria of acid-base buffer systems 19.2: Acid-base titration curves 19.4: Equilibria involving complex ions
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Alka-seltzer ingredients Citric acid pK a1 = 3.15; pK a2 = 4.77; pK a3 = 6.40 Aspirin (acetylsalicylic acid) pK a = 3.5 Sodium hydrogen carbonate (a salt of the weak acid, carbonic acid ) H 2 CO 3 : pK a1 = 6.35; pK a2 = 10.33 QuickTimeª and a decompressor are needed to see this picture.
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Weak-acid equilibria in water: Acetic Acid Vinegar is a dilute solution of acetic acid; most samples of  vinegar contain 3 to 4% by weight of acetic acid. CH 3 CO 2 H (aq)  +  H 2 O (l)   CH 3 CO 2 - (aq)  +  H 3 O + (aq) K a  = 1.8 x 10 -5 What is the pH of vinegar (0.52 M acetic acid,  CH 3 CO 2 H) at 25  o C? 1) Calculate [H + (aq) ], using [CH 3 CO 2 H (aq) ] initial  and K a 2) Calculate pH using [H + (aq) ]
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Weak-acid equilibria in water: Acetic Acid What is the pH of vinegar (0.52 M acetic acid,  CH 3 CO 2 H) at 25  o C? K a  = 1.8 x 10 -5 I   0.52 M              --                0                 ~0 K a    = [CH 3 CO 2 - (aq) ] [H 3 O + (aq) ] [CH 3 CO 2 H (aq) ] C E CH 3 CO 2 H (aq)  +  H 2 O (l)   CH 3 CO 2 - (aq)  +  H 3 O + (aq)
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Weak-acid equilibria in water: Acetic Acid What is the pH of vinegar (0.52 M acetic acid,  CH 3 CO 2 H) at 25  o C? K a  = 1.8 x 10 -5 I   0.52 M              --                0                 ~0 C E =  ( x )  ( x )    (0.52 M  – x ) CH 3 CO 2 H (aq)  +  H 2 O (l)   CH 3 CO 2 - (aq)  +  H 3 O + (aq)
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Strong-acid equilibria in water: Hydrochloric Acid What is the pH of 0.52 M hydrochloric acid, HCl at  25 o C? I   0.52 M              --                0                 ~0 C E     HCl (aq)  +  H 2 O (l)   Cl - (aq)  +  H 3 O + (aq) pH = 0.28 Cf:  What is the pH of vinegar (0.52 M acetic acid,  CH 3 CO 2 H, at 25  o C? (K a  = 1.8 x 10 -5 ; pK a  = 4.74) K a    10 7  (pK a    -7)
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Weak-base equilibria in water: Sodium Acetate CH 3 CO 2 H (aq)  +  H 2 O (l)   CH 3 CO 2 - (aq)  +  H 3 O + (aq) What is the pH of 0.52 M sodium acetate, NaCH 3 CO 2
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