Ammonium salts are chemical compounds formed when ammonia (NH3) reacts with an acid. They consist of the ammonium ion (NH4+) and an anion from the acid. Common examples include ammonium chloride (NH4Cl) and ammonium sulfate ((NH4)2SO4). These salts are often used in fertilizers, food processing, and as laboratory reagents. In solution, ammonium salts can dissociate into their constituent ions, making them useful in various applications. They can also act as a source of nitrogen, which is essential for plant growth. Additionally, ammonium salts are important in the production of certain pharmaceuticals and industrial chemicals.