Which statement is true regarding the properties of ammonia?

Ammonia is classified as a base due to its ability to accept protons (H⁺ ions) when dissolved in water, producing hydroxide ions (OH⁻). This behavior aligns with the Brønsted-Lowry definition of acids and bases, where ammonia acts as a proton acceptor. The presence of the lone pair of electrons on the nitrogen atom allows ammonia to interact readily with protons, leading to the formation of ammonium ions (NH₄⁺) in aqueous solutions.

This basic property of ammonia is evident in its interactions with acids, neutralizing their effects and increasing the pH of the solution. In contrast, while ammonia does exhibit some volatility due to its low boiling point, describing it as stable in a general context may not fully capture its reactivity with acids and its tendency to form various compounds. Additionally, ammonia is not neutral; it clearly alters pH when dissolved in water, supporting its characterization as a base. Therefore, the correct statement regarding the properties of ammonia emphasizes its role as a base.