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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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