controlled content drinking water controlled hydrogen ion content drinking water 2013-03-01T16:10:48Z A drink made up of water containing a specified amount of hydrogen ions, the chemical element with atomic number 1 that have lost one electron forming a cation with a charge of +1, for consumption by an organism in an experiment. Adjusting the amount of hydrogen ions adjusts the acidity, i.e. the pH of the drinking water. XCO:0000257 controlled acidity water controlled pH water experimental_condition_ontology jsmith water with adjusted pH