Skip to main content
Back

Diprotic Acids and Bases quiz

Control buttons has been changed to "navigation" mode.
1/15
  • What is a diprotic acid?
    A diprotic acid is a compound that can donate two H+ ions in solution.
  • What are the two equilibrium constants associated with diprotic acids?
    The two equilibrium constants are Ka1 for the first proton dissociation and Ka2 for the second, with Ka1 always greater than Ka2.
  • Why is Ka1 always greater than Ka2 for diprotic acids?
    Ka1 is greater than Ka2 because it is easier to remove the first acidic hydrogen than the second.
  • What is the generic formula for a diprotic acid?
    The generic formula for a diprotic acid is H2A.
  • What is the equilibrium expression for the first dissociation of a diprotic acid?
    The expression is Ka1 = [A^-][H3O^+]/[H2A].
  • What is the equilibrium expression for the second dissociation of a diprotic acid?
    The expression is Ka2 = [A^2-][H3O^+]/[A^-].
  • What is a diprotic base and how is it represented?
    A diprotic base can accept two H+ ions and is often represented as A^2-.
  • What are the equilibrium constants for diprotic bases?
    The constants are Kb1 for the first proton acceptance and Kb2 for the second.
  • What is the relationship between Ka1, Kb2, and Kw for diprotic species?
    Ka1 × Kb2 = Kw, where Kw is the dissociation constant of water.
  • What is the value of Kw at 25°C?
    Kw is 1.0 × 10^-14 at 25°C.
  • What is an amphoteric species in the context of diprotic acids and bases?
    An amphoteric species can act as either an acid or a base, depending on the reaction conditions.
  • Which equilibrium constant is used when an amphoteric intermediate donates a proton?
    Ka2 is used when the intermediate donates a proton.
  • Which equilibrium constant is used when an amphoteric intermediate accepts a proton?
    Kb2 is used when the intermediate accepts a proton.
  • Name two common acidic amphoteric species.
    Hydrogen sulfate (HSO4^-) and hydrogen sulfite (HSO3^-) are common acidic amphoteric species.
  • Name two common basic amphoteric species.
    Hydrogen carbonate (HCO3^-) and hydrogen phosphate (HPO4^2-) are common basic amphoteric species.