In this very popular Applied Science Concept Kit, students perform a series of very colorful tests that help them to develop a better understanding of pH, and its relationship to acids and bases, and its effect on indicator dyes. Using a LAB-AIDS‚® Chemplates‚® and universal indicator, each student creates his own pH color guide. This color guide is then used to identify the pH of the three unknowns, which are provided in this kit.