SWEET Ontology
type: Ontology
version info: 2.3
imports: matr.owl
imports: matrCompound.owl
imports: propMass.owl
imports: prop.owl
imports: propQuantity.owl
imports: stateChemical.owl
imports: statePhysical.owl
imports: relaSci.owl
imports: relaChemical.owl
imports: rela.owl
imports: matrIon.owl
imports: matrElement.owl
imports: repr.owl
imports: propIndex.owl
imports: reprSciUnits.owl

pH
type: Class
subclass of: ChemicalQuantity
comment: pH is a measure of the acidity or basicity of a solution. It is defined as the cologarithm of the activity of dissolved hydrogen ions (H+). Hydrogen ion activity coefficients cannot be measured experimentally, so they are based on theoretical calculations. The pH scale is not an absolute scale; it is relative to a set of standard solutions whose pH is established by international agreement. [Wikipedia]

Solubility
type: Class
subclass of: ReactionProperty
comment: The total amount of solute species that will remain indefinitely in a solution maintained at constant temperature and pressure in contact with the solid crystals from which the solutes were derived.