To determine which condition would shift the system in dynamic equilibrium to dark blue, we need context about the chemical equilibrium and what the dark blue represents (for instance, if it indicates a particular concentration of a species in the equilibrium).
However, in many cases concerning copper complexes, adding ammonia typically creates a brighter blue solution because ammonia can form a complex with Cu²⁺ ions, leading to the formation of [Cu(NH₃)₄]²⁺, which is usually dark blue.
Given this context, adding ammonia would likely shift the equilibrium toward the formation of the blue complex, resulting in a darker blue color.
So, the correct answer is:
Adding ammonia
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