1. Education

Video:How to Make Hot Ice

with Anne Marie Helmenstine

All you need are two common kitchen ingredients to make hot ice - a non-toxic chemical that crystallizes when you touch it into a material that looks like ice except it gives off heat. See how to make hot ice and get ideas for fun hot ice activities.See Transcript

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Transcript:How to Make Hot Ice

Hi, I'm Dr. Anne Helmenstine for About.com. I'm going to show you how to make hot ice. This is an interesting nontoxic chemical you can make from ingredients you have in your kitchen. What's so great about hot ice? You can make it crystallize on command and can form crystal sculptures with it. Here's what you do.

Hot Ice Materials

All you need to make hot ice is white vinegar, which is weak acetic acid, and baking soda, which is sodium bicarbonate.

Prepare the Hot Ice

Mix one liter of vinegar with 4 tablespoons of baking soda. These chemicals react to form nontoxic sodium acetate or hot ice in water. You need to boil off most of the water, so heat the solution until it is boiling and keep applying low heat until you see a crystal skin start to form on the surface of the liquid. Remove the hot ice solution from heat, pour it into a new container and refrigerate the solution until it is chilled.

Instant Hot Ice Crystals

When the hot ice has cooled, you can get it to instantly crystallize simply by touching it. You can try crystallizing the hot ice as you pour it, too. Either way, the solution will give off heat as it crystallizes.

When You Are Finished

You can re-dissolve and reheat the hot ice to play with it again or you can throw it away when you are finished.

I hope you've enjoyed making hot ice. You can learn more about hot ice and can get ideas for other projects if you visit me online at About.com. Thanks for watching.
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