Standard amount concentration

{
  "id": "MLC-T-CHM-011280",
  "term": "Standard amount concentration",
  "field": "Chemistry",
  "definition": "A conventional reference value of amount concentration, written c° and usually set at 1 mol dm-3, used to make concentrations dimensionless in thermodynamic expressions. It fixes the standard state of a solute on the concentration scale and appears in Sørensen's original pH definition, pH = -lg(c_H/c°). The molality-based counterpart, m°, is 1 mol kg-1.",
  "synonyms": [
    "standard concentration"
  ],
  "subject": "Analytical Chemistry",
  "references": [
    "PAC, 2008, 80, 233. 'Glossary of terms related to solubility (IUPAC Recommendations 2008)' on page 267 (https://doi.org/10.1351/pac200880020233)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/standard-amount-concentration/"
}