There is an easy science experiment to make homemade ice-cream with your kids. In which one make icecream in 10min by puting a bag with ice-cream ingredients into a bag of ice and salt.
**Simply put what is the salt doing? Is it really necessary?**
p.s. I feel that this just a case of freezing point depression and that the resulting saline solution offers a greater surface area than ice and is colder than normal water, thus helps freezing the ice cream more quickly. However, the other side argues that the melting chemical reaction causes the saline solution to get colder.
In: Chemistry
You’re right, it’s just that the freezing point is lower, so the saline solution chills the bag more effectively because of the greater surface area.
> However, the other side argues that the melting chemical reaction causes the saline solution to get colder.
Melting is not a chemical reaction, but it is precisely the ice melting at the depressed freezing point that makes the water colder. You’re both using different insufficiently technical language to describe the same physical effect.
If it were surface area, adding water would be enough.
Latest Answers