Why Does Water Dissolve Salt?

Individuals explore solubility by modeling how water dissolves salts. They then view a video and compare how well water and alcohol dissolve salts, relating their comparisons to the structure of each molecule. 

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CCSS: Designed
NGSS: Designed
Instructional Ideas

  • Relate the concept and make it relevant to learner's lives through discussions of ocean water, lemonade, liquid soaps, or any ionically bonded substance that water can dissolve; have them imagine how things would be different if water acted more like alcohol or couldn't dissolve these substances
Classroom Considerations

  • Follow safety guidelines in lab and for your classroom/school when handling isopropyl alcohol in the lab
  • Pupils may need more time to answer questions in the lab
  • Part three in a series of nine
Pros

  • Includes activity sheet, answer keys, video links, and teacher references
  • Provides pre-scripted questions for teachers to ask throughout the lesson
  • Requires simple materials found in most science classrooms
Cons

  • None