The answer is straightforward: phenolphthalein turns colorless in an acidic solution. When the pH of the solution is below 8.3, the indicator remains in its non-ionized form, which does not absorb ...

This educational film explores acid-base indicators and their color changes in response to acidity. It demonstrates how substances like tea, red cabbage, and litmus paper react when acids are added, ...

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 ...