Von Weimarn ratio

{
  "id": "MLC-T-CHM-012626",
  "term": "Von Weimarn ratio",
  "field": "Chemistry",
  "definition": "The relative supersaturation of a solution during precipitation, calculated as the difference between Q and S divided by S, where Q is the solute concentration at which nucleation occurs and S is the solubility. Precipitates grow coarser as the ratio falls, so gravimetric precipitations keep Q low and S high, using dilute solutions, slow reagent addition and elevated temperature.",
  "synonyms": [
    "relative supersaturation"
  ],
  "subject": "Analytical Chemistry",
  "see_also": [
    "gravimetric analysis"
  ],
  "references": [
    "PAC, 2025, 97, 137. 'Glossary of terms for mass and volume in analytical chemistry (IUPAC Recommendations 2024)' on page 9 (https://doi.org/10.1515/pac-2023-0903)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/von-weimarn-ratio/"
}