Zero point

{
  "id": "MLC-T-CHM-012800",
  "term": "Zero point",
  "field": "Chemistry",
  "definition": "The theoretical potential of a pH electrode when the hydrogen ion activity of the solution is equal to unity, corresponding to a pH of 0. This point is used in the calibration of pH meters to establish the reference potential for subsequent measurements. For a standard hydrogen electrode, the zero point potential is defined as 0 volts at all temperatures.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "pH",
    "reference electrode"
  ],
  "references": [
    "PAC, 1985, 57, 531. 'Definition of pH scales, standard reference values, measurement of pH and related terminology (Recommendations 1984)' on page 541 (https://doi.org/10.1351/pac198557030531)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/zero-point/"
}