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Buffer quiz #1

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Terms in this set (39)

  • What is the function of a buffer?
    A buffer resists drastic changes in pH when small amounts of acid or base are added.
  • What is true about buffer solutions?
    Buffer solutions resist significant changes in pH when small amounts of acid or base are added.
  • How would you describe a buffer solution?
    A buffer solution contains a weak acid and its conjugate base (or a weak base and its conjugate acid) and resists changes in pH.
  • What happens to a buffered solution when a small amount of base is added?
    The pH increases slightly, but the buffer neutralizes most of the added base, minimizing the change.
  • A titration curve for a weak acid is shown. Which point shows the most buffering?
    The half-equivalence point shows the most buffering, where the concentrations of weak acid and conjugate base are equal.
  • What is a buffer?
    A buffer is a solution that resists changes in pH when small amounts of acid or base are added.
  • How does the buffer maintain the pH of the solution when an acid is added to it?
    The conjugate base in the buffer neutralizes the added acid, minimizing the pH change.
  • What can be added to a solution of acetic acid to prepare a buffer?
    A salt containing the conjugate base, such as sodium acetate, can be added to acetic acid to make a buffer.
  • What type of solution is a buffer?
    A solution containing a weak acid and its conjugate base, or a weak base and its conjugate acid, is a buffer.
  • What results from mixing equal volumes of a weak acid and its conjugate base?
    Mixing equal volumes of a weak acid and its conjugate base (or weak base and its conjugate acid) gives a buffer solution.
  • What constitutes a buffer system?
    A mixture of a weak acid and its conjugate base, or a weak base and its conjugate acid, is a buffer system.
  • Which pair of solutions will form an effective buffer?
    A weak acid and its conjugate base, or a weak base and its conjugate acid, will form an effective buffer.
  • What does the midpoint of the titration of a weak acid with a strong base correspond to?
    The midpoint corresponds to the half-equivalence point, where the concentrations of weak acid and conjugate base are equal.
  • What pH does a buffer maintain?
    A buffer maintains a relatively constant pH, close to the pKa of the weak acid in the buffer.
  • What is the chemical in baking soda that serves as a buffer?
    The chemical in baking soda that acts as a buffer is sodium bicarbonate (NaHCO₃).
  • How do buffers moderate pH change?
    Buffers neutralize added acids or bases, minimizing changes in pH.
  • Which of these are better as buffers for solutions with a pH less than 7?
    Buffers made from weak acids and their conjugate bases are better for solutions with pH less than 7.
  • What is the effect of a buffer on a solution?
    A buffer stabilizes the pH of a solution, preventing large changes when acids or bases are added.
  • What combination makes the best buffer?
    A combination of a weak acid and its conjugate base in approximately equal concentrations makes the best buffer.
  • Which conjugate acid-base pairs function as buffers?
    A weak acid and its conjugate base, or a weak base and its conjugate acid, will function as a buffer.
  • What combinations can be used to make a buffer?
    A weak acid and its conjugate base, or a weak base and its conjugate acid, can be used to make a buffer.
  • What mixtures may act as a buffer solution?
    A mixture of a weak acid and its conjugate base, or a weak base and its conjugate acid, may act as a buffer solution.
  • Which solution is a buffer?
    A solution containing both a weak acid and its conjugate base, or a weak base and its conjugate acid, is a buffer.
  • What does a buffer solution comprise?
    A buffer solution comprises a weak acid and its conjugate base, or a weak base and its conjugate acid.
  • What substance would you add to CH3COONa(aq) to form a buffer solution?
    You would add acetic acid (CH3COOH) to CH3COONa(aq) to form a buffer solution.
  • What aqueous mixtures would be a buffer system?
    A mixture of a weak acid and its conjugate base, or a weak base and its conjugate acid, would be a buffer system.
  • Which of these are better as buffers for solutions with a pH greater than 7?
    Buffers made from weak bases and their conjugate acids are better for solutions with pH greater than 7.
  • What type of substance works to resist changes in the pH of a solution?
    A buffer works to resist changes in the pH of a solution.
  • How would you buffer a solution that has a pH of 12?
    Use a weak base and its conjugate acid with a pKa close to 12 to buffer a solution at pH 12.
  • What may a suitable buffer mixture contain?
    A suitable buffer mixture contains a weak acid and its conjugate base, or a weak base and its conjugate acid.
  • What is always a characteristic of a solution that contains a buffer?
    A buffered solution resists significant changes in pH when small amounts of acid or base are added.
  • In a buffer system, what happens when acid or base is added?
    The buffer neutralizes the added acid or base, minimizing the change in pH.
  • How does a solution that contains a buffer behave?
    A solution that contains a buffer resists changes in pH upon addition of small amounts of acid or base.
  • Which pair of compounds will form a buffer in aqueous solution?
    A weak acid and its conjugate base, or a weak base and its conjugate acid, will form a buffer in aqueous solution.
  • What combinations can be used to make a buffer assuming equal volumes are used?
    A weak acid and its conjugate base, or a weak base and its conjugate acid, can be used to make a buffer.
  • How can a buffer of H2CO3/NaHCO3 be created?
    Mixing carbonic acid (H2CO3) with sodium bicarbonate (NaHCO3) creates a buffer.
  • Which pairs of acids and bases cannot be mixed to form a buffer solution?
    A strong acid and a strong base cannot be mixed together to form a buffer solution.
  • Which set of compounds would form a buffer in aqueous solution?
    A weak acid and its conjugate base, or a weak base and its conjugate acid, would form a buffer in aqueous solution.
  • What type of aqueous solutions are considered good buffer systems?
    Aqueous solutions containing a weak acid and its conjugate base, or a weak base and its conjugate acid, are good buffer systems.