What visible indication might occur if ammonia vapor is passed near a leaking chlorine cylinder valve?

When ammonia vapor comes into contact with chlorine, a visible chemical reaction occurs, generating a dense white smoke or cloud. This reaction forms ammonium chloride, a product that is seen as a white mist or smoke. This phenomenon is commonly referred to in the context of safety protocols when handling chlorine, as mixing it with ammonia can be hazardous and produce toxic fumes.

The generation of white smoke serves as a clear visual indication of the interaction between the two gases, highlighting the importance of monitoring chemical exposures closely in water treatment facilities. Understanding this reaction is crucial for operators to ensure the safety of both personnel and the surrounding environment. Thus, the appearance of white smoke is a significant indicator of a potential problem that needs immediate attention for safety measures and operational protocols.