If ammonia has leaked into the brine, what color will Nessler's solution turn?

Nessler's solution is a chemical reagent used specifically for detecting ammonia. When ammonia is present, Nessler's solution reacts to form a colored complex that indicates the presence of ammonium ions. The color change of Nessler’s solution in this case is a characteristic yellow hue that signifies the presence of ammonia.

The reaction involves the formation of a yellow-colored compound, which is due to the formation of a diazonium compound from the reaction between Nessler's reagent and ammonia. This color change is a vital indicator in water quality testing, particularly in chlorinated water systems where ammonia presence needs to be monitored.

Understanding this context about Nessler’s solution highlights its importance in environmental monitoring and safety, as well as its role in identifying potential hazards due to ammonia leaks. The other color options would not represent a correct reaction to ammonia in Nessler's solution, as they do not align with the established chemistry of the reagent.