Salty Lab…..

Lesson Objectives:

  • Determine how many teaspoons of salt it takes to float an egg in water.
  • What happens when we vary the volume of water?

Questions to answer in the lab:

  • What are the density of liquids when compared to different densities of solids?
  • How can we make a fresh egg float in water?



1. Measure 175 mL of water in your graduated cylinder and pour into your plastic cup.

2. Place the egg in the water.

3. Add teaspoons of salt (keep track of how many!) to your water until your egg floats.

4. Record the number of teaspoons on the bar chart.

PART 2: (Your team will be assigned an amount of water to test)

1. Measure your volume of liquid and pour into a container.

2. Add teaspoons of salt, one at a time and stir, so that you can see if enough salt added can float the egg. Stir the water well until the salt dissolves completely.

3. Once the egg floats, record how many spoons of salt were added. (It should do this for you when you enter your data.

4. Share data with other teams.

Follow-up Questions:

1. How does adding salt to the water help an egg to float in that water?

2. How can these results help us to understand why a diver wears weight belts in salt water?

3. What results would you expect if we tried using different liquids?

4. What other substances could we add to the water that would make the egg float?

5. What are you wondering now?

Link with an explanation based on particles

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