Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Students will be able to explain that if two substances cause turn a pH indicator different colors, they must be different substances. Students will be able to explain that the color that a substance ...

Discover how red cabbage can act as a natural pH indicator, revealing whether substances are acids or bases through beautiful color changes. pH is a measure that tells us how acidic or basic a ...

CORRECTION: This story was updated on Aug. 1, 2014, to clarify that the test detects many strains of Escherichia coli, not just pathogenic ones. To lower costs, Davis looked for a glucuronide with a ...