Question

What chemical do you use to remove CO₂ from inside a flask in certain experiments on photosynthesis?

Answer 1

To show that carbon dioxide (CO₂) is necessary for photosynthesis, a plant with de-starched leaves is used. One leaf is placed inside a conical flask containing potassium hydroxide (KOH). KOH absorbs the CO₂ present inside the flask. Thus, the leaf does not get CO₂ for photosynthesis.