Making Hard Water Soft

We need softened water to easily clean our homes, our clothes, and our bodies ... but how do you soften hard water? Part six of a 7-video series exploring the world's water resources and issues shows the two most common methods of accomplishing this task. The video illustrates both the processes and the chemistry behind them.

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Instructional Ideas

  • Set up the featured soap/hard water titration as a demonstration or pair students and assign it as a lab experiment
  • Bring a bag of water softener salts to show the class
Classroom Considerations

  • Use the embedded pause within the resource to ensure pupils remember the outcome of boiling water with temporary hardness
Pros

  • Presents information clearly through narration and colorful animations
  • The video includes reproducible demonstrations that would also be suitable as experiments
Cons

  • None