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6-pH_TitrationMethods

6-pH_TitrationMethods - pH and Titration Methods Edward A...

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pH and Aq ue o us  S o lutio ns  Pro ble m   S e t Ele c tro lytic  C harac te r C o m pe te nc y  inc luding  S e c tio n F o f the  
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pH and Titration Methods Edward A. Mottel Department of Chemistry Rose-Hulman Institute of Technology
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pH and Titration Methods Reading assignment: Zumdahl: Chapter 4.3, 7.3-7.5, 8.6
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05/12/09 Autoionization of Water Wate r is  a ve ry we ak e le c tro lyte H 2 O (l) H + (aq) + OH (aq) 2 H 2 O (l) H 3 O + (aq) + OH (aq) Dis s o c iatio n c o ns tant K w = [H + ] [OH ] = 1.0 x 10 –14 (@ 25 ° C) Note: H + (aq) H 3 O + (aq)
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05/12/09 pH Base 10 logarithmic scale of hydrogen ion concentration pH = -log [H + ] If pH = -lo g  [H +   ], what do e s  [H +   ]  e q ual? [H + ] = 10 –pH Be  c are ful us e  lo g  and no t ln
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pH pure  wate r at 25 ° C K w   = [H + ] [O H ] = 1.0 x 10 –14 1.0 x 10 –7 M 1.0 x 10 –7 M pH = -lo g (1.0 x 10 –7 ) = 7.0 What’s  the  pH o f pure  wate r at 25  ° C ?  
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pH If the  pH o f an aq ue o us  s o lutio n is  3.50 at 25 ° C , what is  the   hydro xide  io n c o nc e ntratio n ?  
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pH [H + ] = 10 –pH [H + ] = 10 –3.50 = 3.2 x 10 –4 M K w   = [H + ] [O H ] = 1.0 x 10 –14 M 2 [O H ] = K w  / [H + [O H ] = (1.0 x 10 –14 M 2 ) / 3.2 x 10 –4 M = 3.2 x 10
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