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FlinnPREP™ Inquiry Labs for AP® Chemistry: Properties of Buffer Solutions

By: The Flinn Staff

In the Properties of Buffer Solutions Inquiry Lab Solution for AP® Chemistry, students attempt to design an ideal buffer solution effective in a specific pH range and to verify its buffer capacity.

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 16, Primary Learning Objective 6.18

What are buffers made of? How does a buffer work? Can a buffer be designed to be effective in a given pH range? Is there such a thing as an ideal buffer? The purpose of this advanced-inquiry lab kit is to design a buffer solution that will be effective in a specific pH range and to verify its buffer capacity.

Students begin the investigation with an introductory activity to explore the composition and pH of ideal buffers and compare their pH changes when a strong acid and base are added. Understanding the properties of buffers prepares students for the guided-inquiry challenge—to design a buffer that will provide effective protection at a specific pH and that will have the capacity to maintain the pH within a narrow range when prescribed amounts of acid and base are added.  

Complete for 24 students working in pairs.