Which type of liquid pesticide formulation is created by dissolving a substance in a liquid?

The correct answer, solution, refers to a type of liquid pesticide formulation where the active ingredient is completely dissolved in a solvent, resulting in a homogeneous mixture. In a solution, the dissolved particles are at the molecular level, meaning they cannot settle out or be separated by filtration, and they do not scatter light, making the solution clear.

This type of formulation is particularly advantageous for herbicides because it allows for uniform application and effective delivery of the active ingredient to the target organisms. Solutions tend to have better stability and can be easily mixed with other compounds, making them versatile in their usage.

In contrast, a suspension contains solid particles mixed in a liquid, which can settle over time and may require agitation before use. Emulsions involve a mixture of two immiscible liquids, such as oil and water, often requiring an emulsifying agent to maintain homogeneity. A mixture, in general, does not define a specific interaction or solvation process as a solution does, which is crucial for understanding the formulation and application of pesticides.