Digitals Posted June 16, 2005 Share Posted June 16, 2005 I did use the Search function for freezing water but i couldent find anything that actully froze water So I ask the question again how do you Freez water using chemicals ? Thanks for you help. Link to comment Share on other sites More sharing options...
mezarashi Posted June 16, 2005 Share Posted June 16, 2005 Try searching for: endothermic reaction freeze If the reaction is endothermic enough, you should be able to freeze the container. Here's one right here with barium hydroxide and ammonium thiocyanate: http://chemlearn.chem.indiana.edu/demos/Endother.htm Link to comment Share on other sites More sharing options...
Digitals Posted June 16, 2005 Author Share Posted June 16, 2005 Try searching for: endothermic reaction freeze If the reaction is endothermic enough' date=' you should be able to freeze the container. Here's one right here with barium hydroxide and ammonium thiocyanate: http://chemlearn.chem.indiana.edu/demos/Endother.htm[/quote'] Thanx but its not exactly what i ment. Im talking about if lets say you had a cup of water you simply add the chemical mixit or not and then the water freez's *If this is possible*? Link to comment Share on other sites More sharing options...
mezarashi Posted June 16, 2005 Share Posted June 16, 2005 I don't understand what you mean. If the container in which you are stirring the barium and ammonium freezes, doesn't that also constitute the solvent (liquid water) in which they are being mixed in freezing as well? In any case, you might want to search for other reactions as well. The barium seems be somewhat poisonous Link to comment Share on other sites More sharing options...
akcapr Posted June 16, 2005 Share Posted June 16, 2005 add some liquid nitrogen Link to comment Share on other sites More sharing options...
budullewraagh Posted June 16, 2005 Share Posted June 16, 2005 just a note on the barium hydroxide; it must be the octahydrate. otherwise it wont work. shake it with an ammonium salt; it doesnt have to be the thiocyanate Link to comment Share on other sites More sharing options...
akcapr Posted June 16, 2005 Share Posted June 16, 2005 why does it have to be . 8h20? Link to comment Share on other sites More sharing options...
Digitals Posted June 17, 2005 Author Share Posted June 17, 2005 add some liquid nitrogen Lol if only i know where to get it hehe Link to comment Share on other sites More sharing options...
budullewraagh Posted June 17, 2005 Share Posted June 17, 2005 "why does it have to be . 8h20?" shaking Ba(OH)2*8H2O with ammonium salts results in the breaking of bonds between Ba+2 and the oxygen from H2O, which absorbs energy as the electrons move back to their normal configuration. water is released. dissolving ammonium salts in water is generally endothermic as well, so heat is absorbed by this process as well. Link to comment Share on other sites More sharing options...
ThermiteMan Posted June 17, 2005 Share Posted June 17, 2005 well, there is that computer dust cleaner thing that has the liquid cryogen or cyrogen however you spell it. But when that is sprayed into water, the water will freeze almost instantly. Thats all i have so far Link to comment Share on other sites More sharing options...
latentheat Posted June 17, 2005 Share Posted June 17, 2005 Yeah the computer duster is tetrafluoroethane I think. Anyway, if you turn the can upside down and spray into the water it will freeze. It's really fun to do actually. Link to comment Share on other sites More sharing options...
Invader_Gir Posted June 19, 2005 Share Posted June 19, 2005 My friend got violently ill from playing with that stuff. I guess he should've had a window open in is room >.> It is also possible to get sick if you heat up a teflon pan to like 500 degrees. Link to comment Share on other sites More sharing options...
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