lec15 - Announcements Practice, Practice, Practice . Last...

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1 Announcements • Practice, Practice, Practice …. • THE QUARTER IS HALF OVER !!! 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 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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lec15 - Announcements Practice, Practice, Practice . Last...

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