Indicator Sponge—A Discrepant Event Chemical Demonstration Kit

Product Details

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