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EDTA Titration Curves definitions

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  • EDTA
    A chelating agent with a negative four charge in its basic form, used to bind metal ions during titrations.
  • Titrant
    A solution of known concentration, added to react with analyte to determine its quantity in titrations.
  • Metal Ion
    A positively charged atom or molecule that reacts with EDTA to form a stable complex during titration.
  • Complex
    A stable species formed when a metal ion binds with EDTA, altering the net charge and solution composition.
  • Conditional Formation Constant
    An equilibrium value reflecting the stability of a metal-EDTA complex at a specific pH, denoted as K'f.
  • Stability Constant
    A measure of the inherent strength of the bond between a metal ion and EDTA, often expressed as log Kf.
  • Alpha Value
    A fraction representing the proportion of EDTA in its basic, reactive form at a given pH.
  • pH
    A scale indicating the acidity or basicity of the solution, crucial for determining EDTA's reactive form.
  • Equivalence Point
    The stage in titration where the moles of metal ion and EDTA are exactly equal, marking a key calculation step.
  • ICE Chart
    A tabular method for organizing initial, change, and equilibrium concentrations in titration calculations.
  • Dilution Factor
    A ratio accounting for changes in concentration due to mixing different solution volumes during titration.
  • pM
    The negative logarithm of the metal ion concentration, used to monitor changes during titration.
  • Quadratic Formula
    A mathematical tool used to solve for unknown concentrations in equilibrium expressions at the equivalence point.
  • Buffer
    A solution component that maintains a constant pH, ensuring EDTA remains in its reactive form during titration.
  • Excess EDTA
    The amount of EDTA present after the equivalence point, used to determine remaining free metal ion concentration.