Glossary Terms

May 3, 2017

hypochlorous acid (HOCl)

The dominant reaction product of chlorine in water at pH less than 7.
May 3, 2017

hypochlorite

The OCl– anion, which is the dominant reaction product of the chlorine in water at a pH greater than 8. Calcium and sodium hypochlorites are commonly […]
May 3, 2017

hydroxide

A chemical compound containing hydroxyl (OH–) ion.
May 3, 2017

hydrostatic test

A pressure test procedure in which a vessel or system is filled with water, purged of air, sealed, subjected to water pressure, and examined for leaks, […]
May 3, 2017

hydropneumatic system

A system utilizing both air and water in its operation, such as the pressure tank used with many well systems, which utilizes an air chamber to […]
May 3, 2017

hydrolysis

A chemical reaction in which a substance reacts with water and becomes a different substance. Example: The reaction of a salt with water to form an […]
May 3, 2017

hydrologic cycle

The complete circuit pursued by water in nature, including 1. falling of precipitation (rain, hail, sleet, snow, dew); 2. The journal of fallen water over and […]
May 3, 2017

hydrogen sulfide

A corrosive and flammable gas often found dissolved in well water and often accompanied by iron and low pH. It causes a black precipitate with many […]
May 3, 2017

hydrogen ion concentration

The concentration of hydrogen ions, in moles per liter of solution, used as a measure of the acidity of the solution. Expressed as pH. (See pH.)