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Unformatted text preview: Experiment 2 Parts I ‐ II ‐ Volumetric Analysis of an Organic Acid 1 V olumetric Analysis Experiment #2- Parts I-II 1 of an Organic Acid Volumetric Analysis 2 Known volumes of known concentrations are reacted with known volumes of unknowns From reaction equation, relate to moles Common analytical technique: titration with a buret Experiment 2: Acid-base titrations Experiment 4B: Redox titrations Chemical Titration with a Buret 3 Experiment 2 Parts I ‐ II ‐ Volumetric Analysis of an Organic Acid 2 Chemical Titration with a Buret View digital videos posted on WebCT Watch live demos by TAs in the lab Practice, Practice, Practice……….. B t lib t d t d li l t 4 Burets are calibrated to deliver a volume to an accuracy of usually two places after the decimal Chemical Titration with a Buret 5 Starting Volume Ending DO NOT FORGET to record the starting V of titrant before titrating ! Delivered Volume = Ending V – Starting V Volume Titrant Analyte Indicator Stoichiometric Point 6 We are looking for the stoichiometric point : When stoichiometric amounts of the titrant and analyte have reacted A third-party indicator is used to obtain a A third party indicator is used to obtain a visible color change of the solution near the stoichiometric point (at the end point ) Experiment 2 uses a phenolphthalein indicator: the endpoint occurs at the faintest pink color that persists for 30 s Experiment 2 Parts I...
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