25-equilibrium - Ch 8 - Applications of Equilibrium 8.1...

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1 Week 10 CHEM 1310 - Sections L and M 1 Ch 8 - Applications of Equilibrium 8.1 Solutions of Acids or Bases Containing a Common Ion 8.2 Buffered Solutions 8.4 Buffer Capacity 8.5 Titrations and pH Curves 8.6 Acid-Base Indicators 8.8 Solubility Product Sections to Skip: 8.3, 8.7, 8.9, and 8.10 Week 10 CHEM 1310 - Sections L and M 2 Review of an Example What is the [H + ] and the % dissociation of a solution containing 1.0 M HF? HF ( aq ) H + ( aq ) + F - ( aq ) K a = 7.2 x 10 -4 Weak acid K a = [H + ] x [F - ] [HA] 7.2 x 10 -4 = X 2 1.0 Thus, X = [H + ] = ˽ (7.2 x 10 -4 ) = 0.027 M % Dissociation = 0.027 1.0 x 100 = 2.7%
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2 Week 10 CHEM 1310 - Sections L and M 3 Common Ion Effect What happens when more F - is added from a different source? HF ( aq ) H + ( aq ) + F - ( aq ) NaF (s) Na + (aq) + F (aq) More F - added Le Châtelier’s Principle: Equilibrium shifts to left Common Ion What impact does the additional F - have on [H + ]? Week 10
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This note was uploaded on 08/23/2011 for the course CHEM 1310 taught by Professor Staff during the Spring '11 term at University of Florida.

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25-equilibrium - Ch 8 - Applications of Equilibrium 8.1...

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