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lec15 - Announcements THE QUARTER IS HALF OVER Last Time...

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2/9/2012 1 Announcements THE QUARTER IS HALF OVER !!! No class Monday Last Time LeChateliers principle – n, P, and T Bronsted–Lowry Acids and Bases – Conjugate base – A from HA – Conjugate acid – HB from B Autoprotolysis Water is amphiprotic 2H 2 O(l) H 3 O + (aq) + OH (aq) K c = Water concentration change is negligible K w = K c = 1x10 –14 [H 3 O + ][OH ] [H 2 O] 2 [H 3 O + ][OH ] [H 2 O] 2 = Example What are the concentrations of H 3 O + and OH - in a 1.3 x 10 –3 M aqueous solution of the strong acid HCl?
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2/9/2012 2 Example What are the concentrations of H 3 O + and OH - in a 4.5 x 10 –2 M aqueous solution of the strong base NaOH? Comparison of Examples HCl NaOH [H 3 O + ] 1.3 x 10 –3 M 2.2 x 10 –13 M [OH ] 7.7 x 10 –12 M 4.5 x 10 –2 M Changes of ~ 10 orders of magnitude The pH Scale Invented in a brewery – better beer Logarithm base 10 scale pH = – log[H 3 O + ] Autoprotolysis in H 2 O – pH = 7 Acidic solutions – low pH Basic solutions – high pH
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2/9/2012 3 Example
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