Principle

Photosynthesis is performed by all green plants. On land this seems plausible, after all, organisms absorb gas and release gas. In water this only makes sense if you remember that water is a good solvent. Many gases can also be present in water. Carbon dioxide (CO2) dissolves in water in the form of carbonic acid and oxygen (O2) also dissolves. This experiment is based on photosynthesis of algae and the relationship between photosynthesis and the gas pressures of CO2 and O2.

Benefits

• Especially understandable and didactically prepared description of the experiment (reference to everyday life etc.) including protocol questions
• Future-oriented teaching: Integration into digital science lessons with tablets or smartphones
• Increased motivation of students by using the intuitive measureAPP
• Increased media competence
• Compact, easily transportable experimental set-up
• Suitable both as demo experiment and lab course experiment
• Flexible test execution thanks to wireless data transmission

Tasks

1. Measurement of the increase and decrease of the CO2 content in the air in a reaction vessel containing an aquatic plant

Learning objectives

• Photosynthesis of aquatic plants 
• Determination of the change of the CO2 concentration as a function of the light intensity is determined