Ice Cream Lab

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by camrynscarfeh
Last updated 7 years ago


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Ice Cream Lab

Our hypothesis was correct. Making ice cream is an endothermic reaction. Our results showed that in order to freeze the ice cream, we would have to make the ice colder. In order to make the ice colder, it must absorb the energy from the warmer ice cream mixture.

Salt lowers the melting point of water, so when you spread salt on ice the idea is to take advantage of the lower melting point. Water normally turns to water when it reaches 0°C. When salt is added, the temperature drops. A %10 salt solution freezes at -6°C and a %20 solution freezes at -16°C. The difference between Exothermic and Endothermic reactions are exothermic reactions release energy while endothermice reactions absorb energy

The purpose of this lab is to make ice cream and figure out whether the reaction is exothermic or endothermic. Also, we are trying to figuire out why we used salt and ice to freeze the mixture.


Procedure & Equpiment


What did we do?





What I think will happen?

Milk, sugar, cream, and vanilla would mix together and eventually become very cold and thick because of the reaction caused between the salt and ice and the ice cream mixture. We think the mixtures are causing an endothermic reaction because they are absorbing energy.


What happened & Why?

The end result was a sweet, cold treat. This happened because the salt and ice mixture was used to freeze the cream by lowering the freezing point of the mixture. When salt comes into contact with ice, the freezing point of the ice is lowered, causing the ice to melt. Heat must be absorbed by the ice for it to melt. When you use ice to freeze the ice cream mixture, the energy is absorbed from the warmer ice cream mixture. Adding salt to the ice makes it so even more energy has to be absorbed for the ice to melt. This makes the ice colder than it was before, which is why the ice cream freezes.

1/2 cup of milk1/2 cup of whipping cream1/4 cup of sugar1/4 tsp of vanilla1. Mix ingrediens above in a plastic bag and seal it shut2. in a large bag mix >~2 cups of ice >1/2 cup of saltplace small plastic bag inside3. rub the bag until the mixture solidifies 4. Measure temperature of the ice/salt mixture5. Rinse your small bag to get salt off and serve & enjoy!

Background Info


The ice and salt mixture got very cold and almost impossible to hold. The ice cream mixture got lumpy and eventually started thickening.

By Jenna, Quinn, and Camryn


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