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Instant Freeze Water
Instantly Frozen Water Experiment (Poulter, N.d.)
There is a common phenomenon that has been experienced by many people. During the winter, if you leave a bottle of water in a car, garage, or other cold place overnight then something quite interesting can happen -- then the cap is opened, the liquid can freeze instantly. This experiment reproduces this phenomenon using a few simple materials and also explains the science behind what is going on relative to the "instant freeze water." "
The materials needed for the experiment include (Wells, 2013):
Seltzer water -- flavored or plain in plastic bottles. Do not use glass bottles as the liquid may accidentally freeze in the bottle, causing it to explode.
Large bucket
Ice
Rock salt
Thermometer
Experiment
This experiment requires a lot of trial and error to figure out exactly to get the conditions exactly right as there are a lot of factors involved. The measurements of ice, water, and rock salt that are suggested might vary because of environmental factors. With that in mind the experiment follows these steps (Wells, 2013):
1. Start by filling the bucket or container 3/4-full with ice.
2. Place the water bottle in the bowl...
Add a generous amount of rock salt to the bowl.
4. Place the thermometer in the ice mixture and watch the thermometer closely.
5. Wait until the temperature of bowl drops to -8°C. If the soda gets any colder, the liquid will freeze prematurely. Depending on the temperature of the mixture, you might need to add more ice or add more salt.
6. Once the soda (water) has been at the appropriate temperature for 10 minutes, gently remove the bottle from the ice-salt mixture and strike it against the table. Ice crystals should immediately form at the top of the bottle and quickly make their way down through the bottle, creating an instant freeze.
7. As a second experiment, remove another bottle from the ice bath and carefully open it. What happens?
Explanation
Everyone knows that water freezes at 0 °C - or does it? When water freezes, it needs a nucleus in order for the solid crystals to form and become ice and water is typically full of particles and impurities which have no problem kicking off the crystallization process; however, purified water by definition doesn't have those impurities and with nothing for the water molecules to latch onto, purified water can be supercooled as far as -40°C (Winter, 2014). Once the solution is…
References
Poulter, N. (N.d.). Instant Freeze Water. Retrieved from Steve Spangler Science: http://www.stevespanglerscience.com/lab/experiments/instant-freeze-soda-ice/
Wells, S. (2013, January 16). Instant Freeze -- Water Turns to Ice in a Flash. Retrieved from Steve Spangler Science: http://www.stevespanglerscience.com/blog/2013/01/16/instant-freeze-water-turns-to-ice-in-a-flash/
Winter, L. (2014, July 2 ). Turn Water Into Ice Instantly! Retrieved from IFL Science: http://www.iflscience.com/chemistry/turn-water-ice-instantly
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