Create Color-Changing Milk

Overview

Students will explore molecular polarity and learn the importance of soap by creating a burst of color in milk! 

Experiment Length

30 minutes

day 1

materials
  • Dinner plate

  • Cup of milk

  • Food coloring

  • Liquid dish soap

  • Cotton swabs/Q tips

steps
  1. Pour enough milk to cover the bottom of the plate with a depth of ¼ in.

  2. Add one drop each of different colored food coloring close to the center of the milk and close to each other.

  3. Touch one end of a clean cotton swab to the center of the milk. What happens?

  4. Dip the other end of the cotton swab in dish soap, then in the center of the milk. What happens this time?

  5. Try placing the cotton swab in different places in the milk. What happens when you remove the swab?

the science

Milk is mostly water, but it also contains vitamins, minerals, proteins, and tiny droplets of fat suspended in solution. Fats and proteins are sensitive to changes in the surrounding solution (the milk). The secret of the bursting colors is the chemistry of that tiny drop of soap. Inside that tiny drop soap molecule is bipolar, so the water-loving (hydrophilic) end of it dissolves in water while the water-fearing (hydrophobic) end of it attaches to the fat globule in the milk. 

Taking it further

Try the same experiment with different liquids like water, vinegar, nonfat milk, etc. to see if you get the same explosion of color!

 

Learn More About COVID-19

Learn more about handwashing during the pandemic

Another cool experiment using the unique properties of soap 

 

Inspired by Steve Spangler Science

Special thanks to Honor Pimentel and Yaiza Fernandez for the Spanish translation

Challenge

Create a public service announcement for your family and friends about the importance of washing your hands with soap! Your PSA can be in the form of a poster or short video. We have provided a poster example and template here, but feel free to use your creativity!

We will select one lucky kid at the end of the week to win a free Curieus swag bag with a Curieus shirt, stickers, and candy. Submit your PSA to curieusinquarantine@curieus.org by 8 pm on Friday, May 8th!

Share with us

Post your photos and video on social media with #curieusinquarantine or send them to us at curieusinquarantine@curieus.org  for a chance to be featured!

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