Final answer:
The question pertains to liquid-liquid equilibrium in Chemistry, at a college level. The equilibrium can be disturbed by adding more of one component, but it will shift to re-establish equilibrium according to Le Chatelier's Principle.
Step-by-step explanation:
The statement given, "A binary mixture of species A and B are in liquid-liquid equilibrium at 25 °C," implies that two different substances are coexisting in their liquid phases at a given temperature without any net change over time. This is a concept closely related to phase equilibrium in the context of thermodynamics, specifically liquid-liquid equilibrium (LLE).
Equilibrium between gas and liquid phases is explained with the concept that at the boiling point, in a closed container, the rates of boiling (liquid to gas) and condensation (gas to liquid) are equal. Changes in temperature and pressure can alter the rates of these phase changes, yet equilibrium can still be achieved when the rates of boiling and condensation are matched despite these changes.