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Since 1977

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firewatch

It’s magic! It’s a mystery! No—it’s science. Students write secret messages using a disappearing ink sample and then use chemistry to develop and transmit the messages. This activity allows students to explore the properties of a characteristic acid–base indicator, thymolphthalein, and to extend their understanding of pH and acid–base concepts.

Concepts

  • Acids & Bases
  • Indicators
  • pH