Acid/Base Lab Investigation-Testing the Buffering Ability of Antacid Medications

Acid/Base Lab Investigation-Testing the Buffering Ability of Antacid Medications
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(5 pages)
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Product Description

Includes:

Background Info

Lab Procedure

Data Tables

Analysis Questions

Key

Pictures of Ingredients

Indicator Color Chart

Does not Include:

CER Handout


This is a honors or advanced level Biology Lab to study acids, bases, buffers and the pH scale. I accompany this with a CER graphic organizer to answer the question "Which antacid acts as the best buffer?" To complete the CER post-lab I provide students with pictures of the ingredients to include in their reasoning.

This lab gives great results. The Mylanta, Tums and Rolaids contain weak bases which neutralize the HCl for a short time (10-20 drops). The alka-seltzer is a buffered solution which resists changes in pH. Most groups get well over 100 drops of HCl in the alka-seltzer without even a slight color change. It makes a big statement that students easily grasp.

To prepare the indicator just boil a 5-7 full leaves of red cabbage in water until the water becomes purple. The indicator color chart is included at the end of the lab.

Total Pages
5 pages
Answer Key
Included
Teaching Duration
45 minutes
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