Acidity and Alkalinity 2. Minerals Dissolved in Water 3. Acidity and Alkalinity. A water's acidity or alkalinity is measured in terms of pH. Simply put, pH is a chemical term used to measure the concentration of hydrogen ions in water.
Ions are atoms that are either positively or negatively charged, cationic and anionic respectively.
However, there are always exceptions. Make sure to read the label of the pesticide you intend to use as there are always some exceptions. The sulfonylureas such as Ally, Escort, Amber, Harmony Extra, Express, and Accent may inactivate if left in the sprayer tank mixed in acidic water. Higher temperatures will also cause these herbicides to inactivate at a higher rate. This means that an insecticide begins to break down once mixed with high pH water in the sprayer tank.