pH

{
  "id": "MLC-T-CHM-008704",
  "term": "pH",
  "field": "Chemistry",
  "definition": "A numerical scale that quantifies the acidity or alkalinity of an aqueous solution. It is defined as the negative base-10 logarithm of the hydrogen ion activity, or approximately the hydrogen ion concentration. A neutral solution has a pH of 7 at 25 degrees Celsius, with values below 7 indicating acidity and values above 7 indicating alkalinity.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "debye",
    "acidity function",
    "activity coefficient",
    "coefficient",
    "ionic strength",
    "liquid junction",
    "primary pH standards",
    "standard solution",
    "traceability"
  ],
  "references": [
    "Green Book, 3rd ed., p. 75 (https://doi.org/10.1039/9781847557889)",
    "PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 986 (https://doi.org/10.1351/pac199668040957)",
    "PAC, 1997, 69, 1007. 'Reference value standards and primary standards for pH measurements in D2O and aqueousorganic solvent mixtures: New accessions and assessments (Technical Report)' on page 1007 (https://doi.org/10.1351/pac199769051007)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/ph/"
}