Students compare the reaction rates of effervescent antacid tablets under different conditions.
This activity should be done in groups of two or three students. The specific brand of effervescent antacid tablets used for the experiment is not important, but different brands should not be mixed during the experiments. Give student groups only two tablets at a time. Make sure they know how to fill in the stopwatch graphs on the student pages. Although there is little eye hazard involved with the experiment, it is valuable for students to get in the habit of wearing eye protection for experiments involving chemicals.