Which condition indicates that a pesticide is soluble in water?

When assessing whether a pesticide is soluble in water, the presence of runoff serves as a significant indicator. Runoff occurs when excess water flows over the surface of the ground and carries dissolved substances with it. If a pesticide is soluble in water, it easily dissolves in the water, can be transported with it, and is likely to wash away from treated areas, indicating a good level of solubility.

In contrast, clouding of a mixture usually points to the presence of undissolved particles or emulsions, which suggests limited solubility. Oily clumps indicate that the pesticide has formed separate phases and is likely not soluble in water, as oil and water do not mix well. The precipitation of crystals often signifies that a substance is oversaturated in solution, resulting in undissolved residues, again implying poor solubility. Therefore, runoff directly reflects the ability of a pesticide to dissolve in water, establishing its solubility.