Water may appear to be crystal clear, but there could be dissolved substances present. Lab groups make a one-part-per-million of a food coloring solution to demonstrate this concept. As part of an outstanding unit about water, this lesson prepares learners to consider invisible water pollutants in a future lesson.

Concepts

water quality, water, parts per million

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Additional Tags

dissolved substances, water quality, parts per million, science

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Pros

• Supportive projection slide included as a visual aid
• Spanish version of the worksheet provided for English learners
• Part of an outstanding unit produced by a reputable institution
• Interdisciplinary materials available
• Hands-on activity reinforces the teachable concept
• A teacher's video offers tips for implementation

Cons

• None