It precipitates many metallic hydroxides.
In a 50% solution or stronger - as when neat whisky is taken - alcohol precipitates the pepsin which is an essential of gastric digestion, E.nd thereby arrests this process.
Chalcopyrite is decomposed by nitric acid with separation of sulphur and formation of a green solution; ammonia added in excess to this solution changes the green colour to deep blue and precipitates red ferric hydroxide.
Alkaline carbonates give precipitates of basic carbonates, the formation of which is also retarded by the presence of ammonium salts.
They are soluble in water and give characteristic precipitates with platinic and auric chlorides, and with potassium ferrocyanide.
