NH3aq

NH3aq is a chemical notation commonly used to represent an aqueous solution of ammonia. This means ammonia (NH3) is dissolved in water (H2O). When ammonia gas dissolves in water, it undergoes a reversible reaction to form ammonium ions (NH4+) and hydroxide ions (OH-). This equilibrium is represented by the equation: NH3 + H2O <=> NH4+ + OH-. Consequently, aqueous ammonia solutions are alkaline or basic. The concentration of these ions, and thus the pH of the solution, depends on the amount of ammonia dissolved. Aqueous ammonia is a common laboratory reagent and is also used in various industrial applications, including cleaning products, fertilizers, and the production of other chemicals. It is also known as ammonium hydroxide or ammonia water. Handling aqueous ammonia requires caution due to its pungent odor and corrosive properties.