Looking for a safe endothermic chemical reaction

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Discussion Overview

The discussion revolves around finding safe endothermic chemical reactions or processes, specifically those that do not involve water as a solvent and do not produce significant gas. Participants explore various chemical combinations and dissolution reactions that could meet these criteria.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant seeks safe endothermic reactions that do not involve water or produce large amounts of gas.
  • Another participant notes that many endothermic dissolution reactions require water, suggesting that most known safe reactions are performed in aqueous solutions.
  • A different participant expresses skepticism about achieving a safe reaction without water, suggesting a practical demonstration involving salt and ice water to illustrate endothermic effects.
  • One participant proposes urea as a suitable endothermic dissolution reaction in water, highlighting its safety, solubility, and potential use as fertilizer after the reaction.
  • The original poster acknowledges the possibility of using dissolution in water as a viable approach if a suitable reaction cannot be found.

Areas of Agreement / Disagreement

Participants generally disagree on the necessity of avoiding water as a solvent, with some advocating for its use while others maintain that alternatives should be sought. The discussion remains unresolved regarding the feasibility of finding a non-water-based endothermic reaction.

Contextual Notes

Participants express varying assumptions about the safety and environmental impact of potential solvents, and the discussion does not resolve the limitations of finding suitable endothermic reactions without water.

Chad2012
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I’m not very well versed in chemistry so am asking for help. I’m looking for a couple of safe chemicals which combine to react (or dissolve etc.) endothermically. It doesn’t have to be an impressive reaction, it just has to be safe and not produce masses of gas (so that’s 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:
 
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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.
 
Thanks for your reply. If I can't find an appropriate reaction (I'm not feeling optimistic) then I'll try dissolution.
 
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.
 
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
 
I was originally looking for a reaction but dissolution in water should work. Thanks.
 

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