Facilitators read: Bromothymol is a liquid called an, "indicator solution" because it changes
color based on CO, levels. We can use it to detect how much CO, is dissolved in the water at
the start and end of the experiment.
No CO
Some CO
High levels of CO₂
Everyone: Use the information above to organize the model Bromothymol solutions below,
from least CO₂ to most CO₂. Once done, Team Captains, check that everyone agrees.
2
Move These!
Least CO₂
Most CO