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Unreliable indicator
Students test crystal (alum) deodorants using either a red cabbage indicator or a universal indicator. The universal indicator suggests that the deodorant reacts as an acid, whereas the red cabbage suggests that the deodorant reacts as a base. What is happening here?
This resource can be used with different age groups depending on the level of explanation:
- on a submicroscopic level: 16 to 18 years old.
- on a phenomenological level: 12 years and older.
Curriculum links include: Acids, bases, pH indicators, complex formation, pigments, dyes
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