This is a very simple lab that students can do individually or can be done as a demo. Students will use their own carbon dioxide to change the simple chemical solution from blue to green. Then they will see the solution change back when they add oxygen back. I usually do it as an entire class lab because the students are wowed by getting to do/see the color change for themselves. They are most amazed by the way it can be changed back and forth as the beaker is passed from student to student in their lab group. This is a great lab for students who are visual and hands on.
Includes plans for an additional visual demonstration students can pass around and see up close.