Ammonium chloride is a white crystalline salt with the chemical formula NH4Cl. It is commonly used in various applications, including as a food additive, in fertilizers, and in the production of batteries. This compound is soluble in water and has a slightly salty taste. In addition to its industrial uses, ammonium chloride is also found in some cough medicines as an expectorant. It helps to loosen mucus in the airways, making it easier to cough up. Overall, ammonium chloride plays a significant role in both commercial and medicinal fields.