How do buffers resist changes to pH?
Activity Type: Learning Cycle
Course: Modified GOB chemistry
keywords: buffer, buffer capacity, weak acid, conjugate base
The GOB chemistry course is part of a biomedical workforce development program for adults with a wide range of backgrounds. A significant number of students have not studied chemistry before, or have a very basic middle school level. In the laboratory, students will learn to make biological buffer solutions, adjust the pH of a buffer solution by addition of acid or base, and utilize the concept of buffer capacity.
This POGIL activity provides the students with a conceptual understanding of what is happening to the buffer upon addition of acid or base and why the buffer solution shows a smaller change in pH than a solution without any buffer. The particle diagrams are adapted from a tutorial created by Chem Collective: http://chemcollective.org/activities/tutorials/buffers/buffers1
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