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-   -   Looking for a safe endothermic chemical reaction (http://www.physicsforums.com/showthread.php?t=575189)

Chad2012 Feb7-12 09:46 AM

Looking for a safe endothermic chemical reaction
 
Iím not very well versed in chemistry so am asking for help. Iím looking for a couple of safe chemicals which combine to react (or dissolve etc.) endothermically. It doesnít have to be an impressive reaction, it just has to be safe and not produce masses of gas (so thatís carbonate/ bicarbonate and acid out the window). I would preferably not like either substance to be water.

If you know of any such chemicals (if they even exist), I would appreciate your help. Thanks :smile:

chemisttree Feb8-12 01:21 PM

Re: Looking for a safe endothermic chemical reaction
 
There are several dissolution reactions that are endothermic but that requires water of course. Of the safe ones that I know, all are performed in a water solution.

Chad2012 Feb8-12 03:52 PM

Re: Looking for a safe endothermic chemical reaction
 
Thanks for your reply. If I can't find an appropriate reaction (I'm not feeling optimistic) then I'll try dissolution.

LogicX Feb8-12 09:08 PM

Re: Looking for a safe endothermic chemical reaction
 
I'm not sure how you are going to manage it being safe and not have water as your solvent....

Just throw some salt in ice water, show everyone how much faster you can freeze your beer, then give the professor one and I guarantee you will get an A.

epenguin Feb9-12 04:38 AM

Re: Looking for a safe endothermic chemical reaction
 
I don't know why you want the solvent to not be water, anything else is likely to be more polluting.

For aqueous solutions a fairly striking and practical one is urea. It has the advantage of being very water soluble - more than 1g/g and you get a quite noticeable cooling effect on making a concentrated solution. It is cheap. And afterwards you can spread it on your garden or pot plants as fertiliser. Not too concentrated near any plant and I believe an even 5-30 g/m2 is recommended.

An outline of the interactions involved is here http://www.chemtopics.com/aplab/urea.pdf

Chad2012 Feb10-12 04:20 PM

Re: Looking for a safe endothermic chemical reaction
 
I was originally looking for a reaction but dissolution in water should work. Thanks.


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