Chem_208_Lecture_14_BW - Ch 17.2 (Buffer Solutions) PS5 Due...

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1 Ch 17.2 (Buffer Solutions) PS5 Due Friday; PS6 Assigned Today
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2 Water can donate or accept a proton (amphiprotic). K w = [H 3 O + ][OH - ] = 1.00 x 10 -14 (298K) Pure Water: 0.25 M HCl: 0.10 M Acetic Acid: 2H 2 O (l) H 3 O + (aq) + OH - (aq) Autoionization of Water It is both an acid and a base, even in pure water [H 3 O + ] = [OH - ] = 1.00 x 10 -7 M [H 3 O + ] = 0.25M; [OH - ] = 4.00 x 10 -14 M [H 3 O + ] = 1.34 x 10 -3 M; [OH - ] = 7.46 x 10 -12 M
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3 pH = -log 10 [H 3 O + ] pOH = -log 10 [OH - ] The pH and pOH Scale Pure Water: [H 3 O + ] = [OH - ] = 1.00 x 10 -7 M 0.25 M HCl: [H 3 O + ] = 0.25M [OH - ] = 4.00 x 10 -14 M 0.10 M Acetic Acid: [H 3 O + ] = 1.34 x 10 -3 M [OH - ] = 7.46 x 10 -12 M 0.25M Ammonia: [OH - ] = 2.12 x 10 -3 M [H 3 O + ] = 4.72 x 10 -12 M pH = pOH = 7.00 pH = 0.60 pOH = 13.40 pH = 2.87 pOH = 11.13 pOH = 2.67 pH = 11.33 K w = [H 3 O + ][OH - ] = 1.00 x 10 -14 (at 298 K) -log 10 K w = -log 10 [H 3 O + ] - log 10 [OH - ] = -log 10 (1.00 x 10 -14 ) pK w = pH + pOH = 14.00 (at 298 K)
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4 pH = -log 10 [H 3 O + ]p O H = - l o g 10 [OH - ] The pH and pOH Scale pK w = pH + pOH = 14.00 (at 298 K)
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5 pH Meter
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6 Some Weak Acids
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7 Strong acids have relatively weak conjugate bases Strong Acid Weak Base Weaker Acid Stronger Base Weak acids have relatively strong conjugate bases
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8 17: Buffer Solutions • Resists large pH changes upon addition of an acid or base.
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This note was uploaded on 03/29/2009 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).

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Chem_208_Lecture_14_BW - Ch 17.2 (Buffer Solutions) PS5 Due...

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