26-equilibrium - of unknown concentration Reaction...

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1 Week 11 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 11 CHEM 1310 - Sections L and M 2 Making a Buffer How would you prepare 1 L of buffer at pH 5? Week 11 CHEM 1310 - Sections L and M 3 Buffer Capacity Buffer capacity is the amount of protons or hydroxide ions that can be absorbed without a significant change in pH. Buffering Region little to no change in pH with large additions of base n base = n acid
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2 Week 11 CHEM 1310 - Sections L and M 4 pH Titration Controlled addition of a “titrant” of known concentration to a solution of unknown concentration Reaction characteristics Acid-Base Complete reactivity (no side reactions) Color change given by an indicator Week 11 CHEM 1310 - Sections L and M 5 pH Titration Controlled addition of a “titrant” of known concentration to a solution
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Unformatted text preview: of unknown concentration Reaction characteristics Acid-Base Complete reactivity (no side reactions) Color change given by an indicator Week 11 CHEM 1310 - Sections L and M 6 pH Titration Meniscus Read a buret using the level of the meniscus Indicator Phenolphthalein At pH <7: Colorless At pH = 7: PINK (Endpoint) 3 Week 11 CHEM 1310 - Sections L and M 7 pH Titrations n base = n acid Endpoint of a titration = equivalence point Week 11 CHEM 1310 - Sections L and M 8 Titration Problem It takes 37.65 mL of an NaOH solution to titrate 0.6135 g of dissolved potassium hydrogen phthalate (weak acid) to the phenolphthalein endpoint. What is the molar [NaOH]? Solve on board Week 11 CHEM 1310 - Sections L and M 9 Review Acid-Base Equilibria K a for acids or K b for bases Complex Ion Solutions Buffers pH Titrations Dissolution-Precipitation Equilibria K sp for solubility product constants...
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26-equilibrium - of unknown concentration Reaction...

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