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Complexometric Titration of Aluminum and Magnesium Ions in Commercial Antacids. An Experiment for General and Analytical Chemistry LaboratoriesShui-Ping Yang and Ruei-Ying Tsai A novel experiment for determining the total and individual aluminum and magnesium ion content in commercial antacids is described. This experiment is developed with three independent protocols based on complexometric direct and back titrations containing the concepts and usages of blocking, masking, buffer controls and metallic indicators. Yang, Shui-Ping; Tsai, Ruei-Ying. J. Chem. Educ.2006, 83, 906.
A Closer Look at AcidBase Olfactory TitrationsKerry Neppel, Maria T. Oliver-Hoyo, Connie Queen, and Nicole Reed This laboratory experiment uses the sense of smell to determine end points of acidbase titrations. Olfactory indicators include garlic, onions, and vanillin. Results show that garlic and vanillin gave the most accurate results when calculated NaOH molarities were compared to the standardized values. These olfactory indicators in acidbase titrations gave consistent results when tested by a diverse student population. The preparation times, cost, and safety issues are comparable to traditional titration experiments. Neppel, Kerry; Oliver-Hoyo, Maria T.; Queen, Connie; Reed, Nicole. J. Chem. Educ.2005, 82, 607.
