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Ka and Kb quiz

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Terms in this set (15)

  • What does the acid dissociation constant (Ka) measure?
    Ka measures the extent to which an acid donates protons (H+) in water.
  • What is the equilibrium expression for a weak monoprotic acid in water?
    The equilibrium expression is [A-][H3O+]/[HA], ignoring the liquid water.
  • What does a Ka value greater than 1 indicate about an acid?
    A Ka value greater than 1 indicates the acid is strong and ionizes significantly in water.
  • What does the base ionization constant (Kb) measure?
    Kb measures a base's ability to accept protons (H+) in water.
  • How are Ka and Kb related for conjugate acid-base pairs?
    Ka and Kb are related by the equation Kw = Ka × Kb, where Kw is the ionization constant for water.
  • What is the value of Kw at 25°C?
    Kw is 1.0 × 10⁻¹⁴ at 25°C.
  • How do you calculate pKa from Ka?
    pKa is calculated as the negative logarithm of Ka: pKa = -log(Ka).
  • What is the relationship between the strength of an acid and its pKa value?
    The lower the pKa, the stronger the acid.
  • What is the typical Ka value for a weak acid?
    A weak acid typically has a Ka value less than 1.
  • How do you calculate Kb from pKb?
    Kb is calculated as Kb = 10^(-pKb).
  • What is the relationship between pKa and pKb for a conjugate acid-base pair?
    pKa + pKb = 14 for a conjugate acid-base pair.
  • If the Kb of NH3 is 1.76 × 10⁻⁵, how do you find the Ka of its conjugate acid?
    Ka can be found by dividing Kw by Kb: Ka = Kw/Kb.
  • What does a Kb value less than 1 indicate about a base?
    A Kb value less than 1 indicates the base is weak.
  • What does the 'p' in pKa or pKb stand for?
    'p' stands for the negative logarithm (base 10) of the constant.
  • How does the concentration of H+ relate to acid strength?
    The stronger the acid, the greater the concentration of H+ in solution.