Freezing Water !

[Digitals]

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.

[mezarashi]

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

[Digitals]

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*?

[mezarashi]

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

[akcapr]

add some liquid nitrogen

[budullewraagh]

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

[akcapr]

why does it have to be . 8h20?

[Digitals]

add some liquid nitrogen

 

Lol if only i know where to get it hehe

[budullewraagh]

"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.

[ThermiteMan]

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

[latentheat]

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.

[Invader_Gir]

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.