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FlinnPREP™ Inquiry Labs for AP® Chemistry: Buffers in Household Products

By: The Flinn Staff

The Buffers in Household Products Inquiry Lab Solution for AP® Chemistry involves identifying regions in the neutralization of a polyprotic weak acid. Experiment results are used to identify buffering agents in eight household products.

Includes access to exclusive FlinnPREP™ digital content to combine the benefits of classroom, laboratory and digital learning. Each blended learning lab solution includes prelab videos about concepts, techniques and procedures, summary videos that relate the experiment to the AP® exam, built-in student lab safety training with assessments, and standards-based, tested inquiry labs with real sample data. FlinnPREP™ Inquiry Lab Solutions are adaptable to you and how you teach with multiple ways to access and run your AP® labs.

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Big Idea 6, Investigation 15, Primary Learning Objective 6.20

Many household products contain buffering chemicals, such as citric acid, sodium carbonate, sodium benzoate and phosphates or phosphoric acid to safeguard their activity. Students discover the wide range of buffering action using this advanced inquiry lab activity.

The lab begins with an introductory activity to identify the buffering regions in the neutralization of a polyprotic weak acid. The results provide a model for guided-inquiry design of a procedure to determine the buffering agents in eight different household products, including foods and beverages and over-the-counter drugs. Procedures may include creating titration curves, calculating pKa values and analyzing the buffer capacity and composition. Students may recommend additional consumer products for further inquiry study.

Complete for 24 students working in pairs.