(NH2)2CO + H2O = CO2 + 2 NH3 According to Wikipedia, human feces contain several bacteria which possess the enzyme urease, which is supposed to catalyze the above reaction. A couple of days ago, I filled a 60 mL bottle with urine and a little bit of poop, then covered it with a small balloon, hoping to collect the resulting gases. Well, thus far, I have observed no apparent change. How long should it take? Also, could it be that the ammonia and carbon dioxide are dissolving into the water?