High school chemistry class members become "detectives for a day" and use the concept of paper chromatography to analyze a note left at the scene of a crime. Pupils test the ink on the note with a solvent, such as isopropyl alcohol, to uncover amazing results.

 

 

Concepts

alcohols, paper chromatography, solvents, capillary action

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Additional Tags

science

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Instructional Ideas

• Have class members bring in pens to use in the experiment

Classroom Considerations

• Isopropyl alcohol is flammable, so ensure proper safety precautions when performing this lab
• Goggles or safety glasses should be worn during the entire lab

 

 

Pros

• Duration of experiment allows additional time in class to provide pupils with the ability to brainstorm other ideas for analysis (notes from historical figures, hidden messages, etc.)
• Results will amaze pupils and reinforce paper chromatography concept

Cons

• None