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With the Indicator Sponge Chemical Demonstration Kit, amaze students as you introduce acid–base indicators with this “discrepant event” demonstration. Capture students’ attention and challenge their observation and prediction skills.

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Can Red + Red = Blue? Dip a red sponge into a red solution—watch it turn blue. Place the blue sponge into a blue solution—it turns back to red. How can that happen? Amaze your students as you introduce acid–base indicators with this “discrepant event” demonstration! Capture your students’ attention and challenge their observation and prediction skills. Also makes a great safety demonstration—check to see who didn’t clean up spilled acid by wiping the bench top with your magical “Indicator Sponge.” Teacher Demonstration Notes included.  

Concepts: Acid–base indicators.
Time Required: 15 minutes


Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Constructing explanations and designing solutions

Disciplinary Core Ideas

MS-PS1.B: Chemical Reactions
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Cause and effect
Stability and change