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Identifying Acids and Bases quiz #2

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Terms in this set (37)

  • What characteristic makes a substance basic in water?
    A substance that produces OH- ions in water, such as NaOH, is basic.
  • What defines the weakest base among substances in water?
    The base that ionizes the least in water, such as NH3 compared to NaOH, is the weakest.
  • Which is a characteristic of a strong base?
    A strong base completely dissociates in water.
  • Which statement would indicate the presence of an acid?
    The solution turns blue litmus paper red.
  • Which solution is the most basic among common strong bases?
    A solution of a strong base, such as NaOH, would be the most basic.
  • Which ion would have the higher concentration in a basic substance?
    Hydroxide ions (OH-) have higher concentration in a basic substance.
  • Which is true of weak acids and bases?
    Weak acids and bases only partially ionize in water.
  • What is an example of a compound that is neither an acid nor a base?
    A compound that does not release H+ or OH- ions, such as NaCl, is neither an acid nor a base.
  • How does litmus paper indicate a neutral substance?
    Litmus paper remains unchanged in a neutral substance.
  • What is a strong acid?
    A strong acid is one that completely ionizes in water.
  • Which compound in the following pair is the stronger acid? Select the single best answer.
    The compound that ionizes more completely in water is the stronger acid.
  • How does a strong acid differ from a weak acid?
    A strong acid ionizes completely, while a weak acid only partially ionizes.
  • In which pure substances is hydrogen bonding expected?
    Hydrogen bonding is expected in substances with H bonded to N, O, or F, such as H2O or NH3.
  • What is a common use of weak bases?
    Weak bases like ammonia are used in cleaning products.
  • Which base(s) is weaker than ammonia?
    Bases that ionize less than ammonia, such as methylamine, are weaker.
  • What is an example of a strong base?
    KOH is a strong base.
  • Which term describes an acid according to one acid-base theory?
    A Brønsted-Lowry acid is a proton donor.
  • What is the conjugate base of H2O?
    The conjugate base of H2O is OH-.
  • What does the reaction of an acid and a base produce?
    The reaction of an acid and a base produces water and a salt.
  • What type of salts produce a basic solution in water?
    Salts containing the conjugate base of a weak acid, such as NaCN, produce a basic solution.
  • Which compound is the strongest base?
    Among common bases, NaOH is the strongest.
  • Which weak base is the strongest?
    Ammonia (NH3) is the strongest among weak bases.
  • What is a property of bases?
    Bases taste bitter and turn red litmus paper blue.
  • Drain cleaner has a pH of about 14. How can it be classified?
    Drain cleaner is a strong base.
  • What is an example of an acid?
    A substance that releases H+ ions, such as HCl, is an acid.
  • What is an example of an Arrhenius acid?
    HCl is an Arrhenius acid.
  • Which has a pH over 7?
    A basic solution has a pH over 7.
  • What is the strongest base among common bases?
    NaOH is the strongest base among common bases.
  • What is litmus paper used for?
    Litmus paper is used to identify whether a solution is acidic or basic.
  • What is the color of bromcresol green indicator in a solution with a pH value of 2.0?
    Bromcresol green is yellow in a solution with pH 2.0.
  • Are all acids electrolytes in water?
    Yes, all acids are electrolytes in water, but strong acids are strong electrolytes and weak acids are weak electrolytes.
  • Which acid-base definition classifies an acid as an electron-pair acceptor?
    The Lewis acid definition classifies acids as electron-pair acceptors.
  • How can an acid be defined in terms of proton transfer?
    An acid donates a proton (H+) to another substance.
  • Which of these tests would not distinguish an acid from a base?
    Measuring density would not distinguish an acid from a base.
  • To what do all acids owe their chemical reactivity?
    All acids owe their chemical reactivity to the presence of H+ ions.
  • Which weak acid is considered the strongest?
    Among weak acids, HF is considered the strongest.
  • Which example is a weak base?
    Ammonia (NH3) is a weak base.