• Sodium acetate
• Tray or container
• Pan to nearly boil the water
How can ice freeze without bringing it to freezing temperature? Make instanthot ice, of course. Impossible? Possible! By making crystals dissolve in hot water and letting the solution cool off, you can keep the crystals in aqueous form until you "trigger" the solidificationwith your finger. The mixture looks like ice and, because the crystallization is exothermic, the ice-like substance releases heat!
We think that an esoteric reaction can be used tocrystallize some sodium acetate to make “hot ice” let’s see what happen…
1. Dissolve the sodium acetate trihydrate crystals. Dissolve as much sodium acetate as you can in hot, almost boiling water.Add water into your pan. You want to add just enough so that the sodium acetate dissolves. The key is to "pack" or "supersaturate" the water with sodium acetate, so don't add too much water. Theless water you add, the more dense the solution will be, and the better the crystals.
2. When dissolved, pour the solution into a glass of any size. Make sure the remaining undissolved sodiumacetate stays within the pan. Do not let undissolved material get into the glass.
3. Cool the glass of the solution in the refrigerator for an hour or even 30 minutes (use your best judgement). Whatis happening here is that you're bringing the temperature below the temperature at which the solution is saturated. Normally, dissolved crystals crystallize again once you bring them below this point,but in this case, because you have the sodium acetate in a supersaturated solution, it "supercools" meaning that it goes below the normal temperature of crystallization without actuallycrystallizing.}
4. Pour your solution into a tray or container. Be careful not to spill any, and make sure the solution doesn't come into contact with any solid sodium acetate. This step is optional, but in... [continua]
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(2010, 11). Acetato de sodio -ingles. BuenasTareas.com. Recuperado 11, 2010, de http://www.buenastareas.com/ensayos/Acetato-De-Sodio-Ingles/1115969.html
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