What will form in the hydrolysis of urea in urine?
The hydrolysis is the first of two reactions that occurs in aqueous urea. This reaction forms one equivalent of ammonia and one equivalent of carbamic acid. Carbamic acid rapidly decomposes to form gaseous carbon dioxide and another equivalent of ammonia:



The ammonia then simply participates in an equilibrium where it reacts with water to form ammonium hydroxide, or so it is commonly described. There is actually a fair amount of debate on this topic, but it typically written like this: $$\ce{NH3 + H2O &lt;&lt;=&gt; NH4OH}$$