Principle

The pH value (a measure of the concentration of hydrogen ions) in a flowing body of water depends on the geological conditions, the input from agricultural use and plant activity. This experiment investigates how the pH value of a stream changes even over a short distance and a few kilometres from the source.

Benefits

• experiment is part of a complete solution with numerous experiments in the field of ecology
• Measurements possible indoors and outdoors, for mobile use
• Especially understandable and didactically prepared description of the experiment (relevance 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.

Tasks

1. measurement of the pH-value of a running water at different points
2. comparison of the pH values
3. comparison with other waters

Learning Objectives

• Influencing factors on the water body pH value
• pH-lowering effect of plant activity
• pH value of rainwater