T man831 Posted November 25, 2007 Posted November 25, 2007 I have been trying to preform the "HOT ICE" experiment lately and it just has not been working, and i would love some advice on what i might be doing wrong or if its just not possible... HOT ICE experiment ----> can some one pleas explain what is happening here? so i might have a better understanding of were i am going wrong.
NeonBlack Posted November 25, 2007 Posted November 25, 2007 The link is broken, but if it's what I think it is, then you are wasting your time; it's a trick video.
ydoaPs Posted November 25, 2007 Posted November 25, 2007 Link doesn't work. If it's the video with the salt and burning straw, it's a fake.
iNow Posted November 25, 2007 Posted November 25, 2007 He didn't put a space between the link and the smilie, that's all:
ydoaPs Posted November 25, 2007 Posted November 25, 2007 It's not making ice; it's making sodium acetate crystals.
T man831 Posted November 25, 2007 Author Posted November 25, 2007 sorry about that! the link is fixed now! tell me what you think
ydoaPs Posted November 25, 2007 Posted November 25, 2007 Perhaps you didn't get the water quite supersaturated.
swansont Posted November 25, 2007 Posted November 25, 2007 FYI, from http://en.wikipedia.org/wiki/Sodium_acetate Sodium acetate is also used in consumer heating pads or hand warmers and is also used in "hot ice". When sodium acetate trihydrate crystals (melting point 58 °C) are heated to around 100 °C, they melt. When this melt cools, it gives a supersaturated solution of sodium acetate in water. This solution is capable of supercooling to room temperature, well below its melting point, without forming crystals. By clicking on a metal disc in the heating pad, a nucleation center is formed which causes the solution to crystallize into solid sodium acetate trihydrate again. The bond-forming process of crystallization is exothermic, hence heat is emitted.[1] [2][3] The latent heat of fusion is about 264-289 kJ/kg.[4] Which confirms what yourdad said, that you have to supersaturate the solution (though the wiki note that in order to melt them you have to heat them to 100 ºC even though the melting point is 58 ºC is contradictory)
T man831 Posted November 25, 2007 Author Posted November 25, 2007 so does that mean i can just cut open one of the hand warmers and use the content of that? or are there other chemicals in the heating bags? and thank you very much for the help
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