Example: A cup of water is left in the freezer overnight. The result is ice with bubbles in it. Are these bubbles from dissolved gases in the water, or does the water take in gas from the atmosphere as it freezes?
2007-02-27 16:05:04 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
You can show that the bubbles in ice are caused by dissolved gases coming out of solution by "degassing" the water first.
If you boil the water to remove most of the dissolved gases, the ice will be almost entirely clear. This you can prove at home.
If you boil the water and apply a partial vacuum to the liquid (to remove almost all of the dissolved gases), the ice formed will be without bubbles. This might require a vacuum pump and other more specialized laboratory equipment.
2007-02-27 16:23:58 · answer #1 · answered by Richard 7 · 9⤊ 0⤋
That's probably done most often by freezing the water on top first,
then a bubble happens to rise and bump into this "ice cap",
and is stuck there until freezing is complete. It is possible that some air will be forced out of the water by freezing, forming small bubbles where there were none before.
2007-02-28 00:08:58 · answer #2 · answered by Anonymous · 0⤊ 0⤋