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Auto-Ionization quiz

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Termini in questo insieme (15)

  • What is autoionization (or self-ionization) of water?
    Autoionization of water is the process where water molecules react with each other to form H3O+ (hydronium ion) and OH- (hydroxide ion).
  • In the autoionization of water, what roles do the two water molecules play?
    One water molecule acts as an acid (H+ donor) and the other as a base (H+ acceptor).
  • What ions are produced during the autoionization of water?
    The ions produced are H3O+ (hydronium ion) and OH- (hydroxide ion).
  • What is the chemical equation for the autoionization of water?
    The equation is 2 H2O (l) ⇌ H3O+ (aq) + OH- (aq).
  • How can the autoionization of water be simplified in terms of ions?
    It can be simplified as H2O ⇌ H+ + OH-.
  • What does the term 'aqueous' mean when referring to H3O+ and OH-?
    Aqueous means the ions are dissolved in water, not in the liquid state like H2O molecules.
  • What is the ion product constant for water called?
    It is called Kw, the ion product of water.
  • How is Kw mathematically expressed?
    Kw = [H3O+][OH-], where the brackets indicate concentration in moles per liter.
  • What is the value of Kw at 25 degrees Celsius?
    At 25°C, Kw is 1.0 x 10^-14.
  • How does temperature affect the value of Kw?
    Increasing temperature increases the value of Kw.
  • If a problem does not specify temperature, what value of Kw should you use?
    You should use Kw = 1.0 x 10^-14, assuming the temperature is 25°C.
  • According to the Bronsted-Lowry definition, what is an acid and what is a base?
    An acid is an H+ donor and a base is an H+ acceptor.
  • What happens to a water molecule after it donates an H+ ion?
    It becomes an OH- (hydroxide ion).
  • What happens to a water molecule after it accepts an H+ ion?
    It becomes an H3O+ (hydronium ion).
  • Are H+ and H3O+ the same in aqueous solutions?
    Yes, H+ and H3O+ are used interchangeably to represent the hydronium ion in aqueous solutions.