observer1 Posted January 13, 2023 Share Posted January 13, 2023 In the wiki, it is given that urea reacts with water to form ammonia and CO2. CO(NH2)2 + H2O → 2 NH3 + CO2 But when I add urea into water, neither is there and gas coming out as CO2 or any decrease in the level of water The urea just dissolved. How to stop this and make the reaction? Link to comment Share on other sites More sharing options...
chenbeier Posted January 13, 2023 Share Posted January 13, 2023 Need time and bacteria. Smell in toilet room. Link to comment Share on other sites More sharing options...
exchemist Posted January 13, 2023 Share Posted January 13, 2023 5 hours ago, observer1 said: In the wiki, it is given that urea reacts with water to form ammonia and CO2. CO(NH2)2 + H2O → 2 NH3 + CO2 But when I add urea into water, neither is there and gas coming out as CO2 or any decrease in the level of water The urea just dissolved. How to stop this and make the reaction? Can you link to where in "the wiki" you saw this? All the links I saw say you need an enzyme (urease) to catalyse this decomposition. Here is a procedure for doing that: https://edu.rsc.org/download?ac=12704 Link to comment Share on other sites More sharing options...
observer1 Posted January 13, 2023 Author Share Posted January 13, 2023 3 hours ago, exchemist said: Can you link to where in "the wiki" you saw this? Urea - Wikipedia, go to automobile systems Link to comment Share on other sites More sharing options...
chenbeier Posted January 13, 2023 Share Posted January 13, 2023 Add blue reaction is in the combustion chamber ( cylinder) of an internal combustion engine. Add blue is an aqueaous solution of urea. During the combustion takes place it decompose like in wiki written. Link to comment Share on other sites More sharing options...
John Cuthber Posted January 13, 2023 Share Posted January 13, 2023 9 hours ago, observer1 said: In the wiki, it is given that urea reacts with water to form ammonia and CO2. CO(NH2)2 + H2O → 2 NH3 + CO2 But when I add urea into water, neither is there and gas coming out as CO2 or any decrease in the level of water The urea just dissolved. How to stop this and make the reaction? The reaction does happen, but it is very slow. You can increase the rate of reaction with a suitable catalyst e.g. https://en.wikipedia.org/wiki/Urease Link to comment Share on other sites More sharing options...
exchemist Posted January 13, 2023 Share Posted January 13, 2023 (edited) 1 hour ago, observer1 said: Urea - Wikipedia, go to automobile systems Aha, I see. But this is at very high temperatures. In fact, a moment's thought should tell you the reaction won't go at room temperature, because in this system the urea is a supplied as a solution in water. So obviously that is fairly stable. Regarding the kinetics, I imagine you won't need a catalyst if the solution is sprayed into the combustion chamber, or into hot exhaust, at >500C. (Enzyme catalysts would obviously be no use in such a situation anyway.) Also, this is a reaction in which 2 molecules react to generate 3 molecules. The entropy change for such processes tends to be favourable, so the reaction will be thermodynamically more favourable at higher temperatures. (ΔG = ΔH -TΔS) Edited January 13, 2023 by exchemist Link to comment Share on other sites More sharing options...
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