How Can We Find Out What Is in Water?

Using paper chromatography, water watchers discover that several substances might be dissolved even though they aren't visible. In this case, you will prepare a mixture of three different food colorings for them to experiment with. A brief discussion follows. This lesson is part of a unit on the properties and the conservation of water, but stands alone well as a lesson on separating mixtures for a physical science class.

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Pros

  • Cross-curricular extensions, including an art activity
  • Lesson is one in a series of wonderful water lessons
  • Very visual activity 
  • A video by the publisher provides teaching tips
Cons

  • None