Talk to a Flinn Scientist or Customer Service Rep1-800-452-1261M-F 7:30am-5pm CT

Buffer Balancing Acts - Chemical Demonstration Kit

Buffer Balancing Acts - Chemical Demonstration Kit, AP6288
Catalog Number
Buffer Balancing Acts - Chemical Demonstration Kit
Product Description

By: The Flinn Staff

Buffers provide an essential acid-base balancing act in living cells, lakes, and in many consumer products. What are buffers made of and how do they work? First, prepare an ideal pH 7 phosphate buffer - the same buffer that protects enzymes and proteins in cells. Next, use indicators to show how the buffer resists pH changes and protects against acids and bases. Students will learn not only what components are always present in a buffer, but also understand how each component plays a unique role in making the buffer work. Finally, apply what students have learned about buffers by testing the buffer capacity of Alka-Seltzer® tablets. Buffers are one of the most difficult concepts in acid-base chemistry. This demonstration will help you teach about buffers in a way that students will both see and understand. Enough materials are included to perform the demonstration seven times.
Concepts: pH, buffers, weak acid, conjugate base
Time Required: 15 minutes
Chemicals Provided: Hydrochloric acid, sodium hydroxide solution, sodium phosphate, monobasic, and sodium phosphate, dibasic, solutions, bromthymol blue and universal indicators, and Alka-seltzer tablets


  • Buffer Balancing Acts Video
    Buffer Balancing Acts Video
    The ability of a phosphate buffer and Alka-Seltzer® to resist pH changes highlights the physiological role of buffers within cells and in consumer products.
Additional Resources
Flinn Catalog/Reference Manual Page 344
P.O. Box 219, Batavia, IL60510



*Advanced Placement and AP are registered trademarks of the College Board, which was not involved in the production of, and does not endorse, these products.