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Weak Base-Strong Acid Titrations quiz

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  • What is the role of the weak base and strong acid in a weak base-strong acid titration?
    The weak base acts as the analyte (starting material), and the strong acid is the titrant added to it.
  • What chart is used to track moles during a weak base-strong acid titration?
    An ICF (Initial, Change, Final) chart is used, with moles as the units.
  • How do you calculate the equivalence volume in a titration?
    Use the equation M_acid × V_acid = M_base × V_base, where M is molarity and V is volume.
  • What is the pH of a solution containing only a weak base before any acid is added?
    The pH is above 11, calculated using an ICE chart and the base's Kb value.
  • What is the 5% approximation method used for in ICE charts?
    It determines if the 'minus x' in the equilibrium expression can be ignored; if the initial concentration divided by Kb is greater than 500, 'minus x' can be ignored.
  • How is pOH calculated from the concentration of OH⁻?
    pOH is the negative log of the OH⁻ concentration.
  • How is pH determined from pOH?
    pH equals 14 minus pOH.
  • What forms before the equivalence point in a weak base-strong acid titration?
    A buffer system forms, consisting of a weak base and its conjugate acid.
  • Which equation is used to calculate pH in the buffer region of a titration?
    The Henderson-Hasselbalch equation is used: pH = pKa + log([conjugate base]/[conjugate acid]).
  • How is Ka for a weak acid calculated from Kb?
    Ka = Kw / Kb, where Kw is the ionization constant of water (1.0 × 10⁻¹⁴).
  • What happens at the equivalence point in a weak base-strong acid titration?
    The weak base and strong acid completely neutralize each other, forming a weak acid (conjugate acid), and the solution becomes acidic.
  • How is the molarity of the weak acid at the equivalence point calculated?
    Divide the moles of the weak acid formed by the total volume of the solution.
  • What chart is used to determine pH at the equivalence point?
    An ICE chart is used, with molarity as the units.
  • What dominates the pH calculation after the equivalence point?
    Excess strong acid dominates, and pH is calculated directly from its concentration.
  • How does the pH change throughout a weak base-strong acid titration?
    The pH starts above 11 with only weak base, decreases as acid is added, drops below 7 at equivalence, and falls below 1 after the equivalence point.