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Weak Acid Strong Base Titrations quiz

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Terms in this set (15)

  • What chart do you use when reacting a weak acid with a strong base in titrations?
    You use an ICF chart (Initial, Change, Final) instead of an ICE chart, and you use moles instead of molarity.
  • What does the strong base do in a weak acid-strong base titration?
    The strong base neutralizes the weak acid by reacting with its H+ ions to form water.
  • What is produced when H+ from the weak acid reacts with OH- from the strong base?
    Water is produced from the reaction between H+ and OH-.
  • What is the conjugate base formed in the titration of nitrous acid with sodium hydroxide?
    Sodium nitrite (NO2-) is the conjugate base formed, which has one less H than nitrous acid.
  • What are the three calculation points in a weak acid-strong base titration?
    The three points are before the equivalence point, at the equivalence point, and after the equivalence point.
  • What remains after titration before the equivalence point?
    Both weak acid and its conjugate base remain, forming a buffer solution.
  • Which equation is used to find pH before the equivalence point in a weak acid-strong base titration?
    The Henderson-Hasselbalch equation is used to find pH when a buffer is present.
  • How do you calculate pH before the equivalence point using the Henderson-Hasselbalch equation?
    pH = pKa + log([conjugate base]/[weak acid]), using the moles of each remaining after reaction.
  • What happens after the equivalence point in a weak acid-strong base titration?
    The strong base is in excess, and only strong base and conjugate base remain; no buffer is present.
  • How do you find pH after the equivalence point in a weak acid-strong base titration?
    Calculate the molarity of the excess strong base, find pOH, then use pH = 14 - pOH.
  • What is true about the amounts of acid and base at the equivalence point?
    The moles of weak acid and strong base are equal, so both are completely neutralized.
  • What remains at the equivalence point in a weak acid-strong base titration?
    Only the conjugate base remains in solution at the equivalence point.
  • How do you determine pH at the equivalence point in a weak acid-strong base titration?
    Find the molarity of the conjugate base, set up an ICE chart, and use Kb to calculate pH.
  • Why can't you use the Henderson-Hasselbalch equation after the equivalence point?
    There is no buffer present because all weak acid has been neutralized, so the equation does not apply.
  • What principle explains the transfer of moles from reactants to products in titration?
    The law of conservation of mass states that matter is neither created nor destroyed, only transformed.