Some degree of agitation is generally required to keep an emulsion from separating.

• A. True
• B. False
• C. Not sure
• D. Sometimes

Answer: (A)

Emulsions are mixtures where tiny droplets of one liquid are dispersed in another, and they won’t stay mixed on their own. They are thermodynamically unstable, so without energy input the droplets tend to collide and fuse, eventually separating into distinct layers. Agitation provides the energy and movement that keeps droplets from coalescing, helping to maintain a uniform dispersion. The emulsifier or surfactant works with that agitation to form and stabilize the droplets, but without continued mixing the emulsion will separate. In pesticide formulations like emulsifiable concentrates or oil-in-water emulsions, you’re taught to keep the mixture agitated during storage and application to prevent separation. So, some degree of agitation is generally required to keep an emulsion from separating.