Web1:09: Don't touch your eyes, face or mouth. 1:27: No food, drinks or gum in the lab and no pens/pencils in your mouth. 1:43: Don't taste chemicals or lab materials and wear protective clothing. 2: ... WebHigh School Inquiry/Scientific Method Plants. This lab involves the qualitative measurement of the changes in carbon dioxide concentration associated with respiration and photosynthesis in the freshwater plant Elodea. Bromthymol blue is used as an indicator for the presence of CO2 in solution. When CO2 dissolves in water, carbonic acid is formed.
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