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Acidity changes of a watercourse with Cobra SMARTsense

Acidity changes of a watercourse with Cobra SMARTsense

Item no.: P1520869

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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.


  • 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.


  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

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