How to Make an Experiment That Involves Mixtures

Test to see if oil and vinegar do mix in this simple science experiment.

Science experiments that require mixing are not only mesmerizing to watch but also interesting to learn about. You may be familiar with the statement that oil and vinegar don't mix, but why not? The polarity in oil and vinegar is resistant to each other, because vinegar, which is comprised mostly of water, has polar (positive and negative) molecules that bond to one another, whereas oil is non-polar. Apply real-world application to this theory by mixing up this fun, child-friendly experiment.

Things You'll Need

• Clear plastic beverage bottle
• 1/2 cup cooking oil
• Funnel
• 1/2 cup vinegar
• Food coloring

Instructions

1. Pour the vinegar into the plastic bottle. Use a funnel to make pouring easy. Squeeze a few drops of food coloring into the vinegar. Replace the cap and shake until the mixture is one color.

2. Remove the cap. Return the funnel into the mouth of the bottle and pour the oil into the mixture. Replace the cap and screw tightly.

3. Shake the bottle vigorously for a few seconds. The oil and vinegar should mix together.

4. Stop mixing and set aside. The two liquids will gradually separate.

Tips & Warnings

• The oil always floats on top of the vinegar, because it has a lower density.

References

• Kids Science Experiment: Vinegar and Oil in a Bottle
• Trinalin's Science Blog: "Like Dissolves Like" because "Opposites Attract": April 2008