Valentine’s Day Activities:
Will it melt the heart? experiment
Why: When salt reacts with ice, it actually lowers water’s freezing point. This is the very simple reason why salt melts ice.
Here are the details! Water’s freezing point is 32 degrees Fahrenheit or 0 degrees Celsius. When salt is added to water, it interrupts the freezing process and slows water’s molecules that are attempting to join in order to form crystals, or what we see as ice or snow.
The more salt that is added to water, the lower the freezing temperature becomes.
When salt is put onto ice, the ice begins to melt. This is because salt pulls some of the water from the ice. This forms salt water, which melts yet more ice. The dissolved salt prevents the melted water from refreezing as the water’s freezing point has been lowered by the salt.
but! 15 degrees Fahrenheit is salt’s freezing point. If it is 15 degrees Fahrenheit or colder, then salt cannot melt ice because that is when salt will freeze!
What you need
- Heart ice cube tray
- Baking soda
- A spoon