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Fractional Compositions and Concentrations definitions

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  • Fractional Composition
    Proportion of each chemical species present in a solution at a specific pH, reflecting the balance between acid and base forms.
  • Conjugate Base
    Species formed when a weak acid loses a proton, increasing in amount as pH rises in solution.
  • Weak Acid
    Substance that partially ionizes in solution, establishing an equilibrium between undissociated and dissociated forms.
  • Acid Dissociation Constant
    Equilibrium constant (Ka) quantifying the extent of ionization for a weak acid in aqueous solution.
  • Henderson-Hasselbalch Equation
    Mathematical relationship connecting pH, pKa, and the ratio of conjugate base to acid concentrations.
  • Formal Concentration
    Total analytical concentration of all forms of a substance in solution, regardless of their chemical state.
  • Monoprotic System
    Chemical system involving acids capable of donating only one proton per molecule.
  • Diprotic System
    System containing acids that can donate two protons, resulting in acidic, intermediate, and basic forms.
  • Intermediate Form
    Species in a diprotic system that has lost one proton but retains another, existing between acidic and basic forms.
  • pKa
    Negative logarithm of the acid dissociation constant, marking the pH where acid and conjugate base concentrations are equal.
  • Alpha
    Symbol representing the fractional abundance of a particular chemical species in solution at a given pH.
  • Mass Balance
    Principle stating that the sum of all forms of a substance equals the total amount initially present in solution.
  • Equilibrium Expression
    Mathematical formula relating the concentrations of reactants and products for a reversible chemical reaction.
  • Hydronium Ion
    Ion (H3O+) produced when an acid donates a proton to water, central to acid-base equilibria.
  • Graphical Representation
    Visual depiction showing how the proportions of different chemical forms change with pH, highlighting intersection points at pKa values.