For Kids

Science Experiment: Melting Point - DIY Slushie


Your favorite drink is a liquid until it gets really cold. Your liquid drink would be pretty good with ice just floating in it...the ice cubes would make the drink colder...but the ice cubes would not make the drink freeze into a slushie.

Ice forms when the temperature of water is 32 degrees or colder. You don't want the ice cubes to melt IN your drink, you want your DRINK to turn slushie. In order to make your drink turn slushie you have to get it really cold. Salt lowers the melting point of water. To make a slushie you want the temperature AROUND your favorite drink to be lower than 32 degrees so the drink itself will freeze.

Try making your favorite drink into a slushie:

What You Need:srpslushiesetup3

  • Your Favorite Drink (Soda, orange juice, lemonade, etc.)
  • Quart-size zip-lock bag
  • Gallon-size zip-lock bag
  • 2 cups ice
  • 1/4 cup salt
  • Bowl

Fill the quart size bag with your favorite drink and zip it closed. HINT: Make sure the bag is zipped really good or your slushie will taste bad when some of the salt leaks into your bag. Put the quart size bag inside the gallon bag. Add the ice and salt to the gallon bag. Zip the gallon size bag closed. Now shake the bag a lot - even play catch with it...gently. In about 15 minutes you will feel the ingredients in the quart size bag starting to firm up. What started out as a liquid is changing to a solid. When it feels done take the quart size bag out of the gallon size bag. Rinse it off good in clean water. Then open the bag, squeeze the slushie into a glass and enjoy!

When you add salt to the ice cubes you lower the melting point of the ice cubes by several degrees. The ice cubes stay colder, longer - long enough to turn your drink slushie. Your salt/ice mixture will make your slushie faster than your freezer! The secret is the catalyst - the salt.

  • TIP: It's OK for a dog to lick the ice, it won't be in your drink anyway!
  • TIP FOR THE DOG: Lick the ice BEFORE the salt goes in!

Science Experiment Idea: Make 3 different quart size bags each filled with the exact same amount of your favorite drink. Fill each of three gallon size bag with the exact same number of ice cubes. Add 1/8 cup of salt to the first gallon size bag and label it with a sharpie, "1/8". Add 1/4 cup of salt to the second gallon size bag and label it "1/4". Add 1/3 cup of salt to the third gallon size bag and label it "1/3". Have a couple friends help you shake and smoosh the bags to make the slushies. Time how long it takes each of the bags to turn into a slushie. Which amount of salt makes a slushie the fastest?

Websites, Activities & Printables:

Science in ContextScience in Context: Temperature is a database you can use in any IndyPL Library Branch or at home. Login using your IndyPL library card number. The Science in Context database will show you articles, images and videos to help you learn about chemical reactions.


You can also ask a math and science expert for homework help by calling the Ask Rose Homework Hotline. They provide FREE math and science homework help to Indiana students in grades 6-12.


Use your indyPL Library Card to check out books about temperature at any of our locations, or check out e-books and e-audiobooks from home right to your device. Need help? Call or ask a Library staff member at any of our locations or text a librarian at 317 333-6877.

Ice Cream and Other Edible Science for Kids

Let your kitchen become a science lab and bake, melt, freeze, or boil an experiment you can eat! #indyplkids IndyPL_CarrieW