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Weak Acid Strong Base Titrations quiz #1

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Terms in this set (10)

  • What is the difference between weak acids and weak bases in the context of a weak acid-strong base titration?
    In a weak acid-strong base titration, the weak acid donates H+ ions and reacts with the strong base, which provides OH- ions. The weak acid is partially ionized in water, while the strong base fully ionizes. The titration process involves tracking the amounts of weak acid and its conjugate base, and the pH calculation method changes depending on whether the solution is before, at, or after the equivalence point.
  • What type of chart is used for calculations in a weak acid-strong base titration, and what units are used?
    An ICF (Initial, Change, Final) chart is used, and calculations are done using moles instead of molarity.
  • Why do we ignore water when performing calculations in acid-base titrations?
    Water is ignored because it does not affect the equilibrium or the calculation of pH in these titration scenarios.
  • What is formed when H+ from a weak acid reacts with OH- from a strong base during titration?
    H+ and OH- combine to form water during the neutralization reaction.
  • What remains in the solution at the equivalence point of a weak acid-strong base titration?
    Only the conjugate base of the weak acid remains in the solution at the equivalence point.
  • How do you calculate pH after the equivalence point in a weak acid-strong base titration?
    Find the molarity of the remaining strong base, calculate pOH using its concentration, and then use pH = 14 - pOH.
  • What equation is used to calculate pH before the equivalence point in a weak acid-strong base titration?
    The Henderson-Hasselbalch equation is used to calculate pH when both weak acid and its conjugate base are present.
  • Why can't the Henderson-Hasselbalch equation be used after the equivalence point in a weak acid-strong base titration?
    It can't be used because there is no weak acid left, so the solution is no longer a buffer.
  • What is the role of the law of conservation of mass in titration calculations?
    It ensures that moles lost on the reactant side are gained on the product side, maintaining mass balance.
  • What calculation method is used to determine pH at the equivalence point in a weak acid-strong base titration?
    An ICE chart is used with the conjugate base's molarity and its Kb value to determine the equilibrium and pH.