Acid-Base Theory Quiz
31 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What best describes an amphiprotic species?

  • A species that can act only as an acid.
  • A species that can act as either an acid or a base. (correct)
  • A species that can act only as a base.
  • A species that cannot donate or accept protons.

    • Lewis acids are defined as substances that can accept protons.

    False

    Give two examples of Lewis bases.

    Ammonia (NH3) and water (H2O)

    The formula for calculating pH from the concentration of hydrogen ions, [H+], is ______.

    <p>-log[H+]</p> Signup and view all the answers

    Match the following compounds with their classification as Arrhenius acid or base:

    <p>HCl = Arrhenius acid NaOH = Arrhenius base NH3 = Cannot be classified H2SO4 = Arrhenius acid</p> Signup and view all the answers

    What is the conjugate base of H2PO4−?

    <p>HPO4²−</p> Signup and view all the answers

    HCl is considered a weak acid.

    <p>False</p> Signup and view all the answers

    In the reaction NH3 + H2PO4− ⇌ NH4+ + HPO4²−, what role does NH3 play?

    <p>base</p> Signup and view all the answers

    The reaction of HCl with H2PO4− results in the formation of ______ and H3PO4.

    <p>Cl−</p> Signup and view all the answers

    Match the acid-base pairs with their respective classifications:

    <p>HCl = Strong Acid CH3COOH = Weak Acid Cl− = Weak Base CH3COO− = Strong Base</p> Signup and view all the answers

    Which statement correctly describes the relationship between a strong acid and its conjugate base?

    <p>A strong acid has a weak conjugate base.</p> Signup and view all the answers

    What ions are formed during the auto ionization of water?

    <p>H+ and OH−</p> Signup and view all the answers

    Which of the following is an amphiprotic species?

    <p>H2O</p> Signup and view all the answers

    All Brønsted-Lowry acids are also Lewis acids.

    <p>True</p> Signup and view all the answers

    What is the self-ionization of ammonia?

    <p>NH3 + NH3 ⇌ NH4+ + NH2-</p> Signup and view all the answers

    According to the Lewis definition, an acid is any species that accepts an __________ pair to form a bond.

    <p>electron</p> Signup and view all the answers

    Which of the following pairs demonstrates a correct Lewis acid-base reaction?

    <p>BF3 + NH3</p> Signup and view all the answers

    What is a key limitation of the Brønsted-Lowry definition of acids and bases?

    <p>It only describes proton transfer reactions.</p> Signup and view all the answers

    Which group contains the strongest acid?

    <p>HClO4</p> Signup and view all the answers

    Amphiprotic species can only donate protons.

    <p>False</p> Signup and view all the answers

    Match the following species with their type:

    <p>HCl = Strong Acid NH3 = Lewis Base OH- = Brønsted-Lowry Base H2O = Amphiprotic</p> Signup and view all the answers

    Lewis acids accept __________ to form bonds.

    <p>electron pairs</p> Signup and view all the answers

    What is the correct expression for the acid-dissociation constant (Ka) for a weak acid (HA)?

    <p>$K_a = \frac{[H_3O^+][A^-]}{[HA]}$</p> Signup and view all the answers

    Weak acids have higher Ka values compared to strong acids.

    <p>False</p> Signup and view all the answers

    What does the symbol Ka represent in acid-base chemistry?

    <p>The acid-dissociation constant</p> Signup and view all the answers

    The ionization constant of _____ acid is represented in the table.

    <p>weak monoprotic</p> Signup and view all the answers

    Match the following weak acids with their corresponding Ka values:

    <p>Acetic acid = 1.8 × 10–5 Formic acid = 1.7 × 10–4 Hydrocyanic acid = 4.9 × 10–10 Hydrofluoric acid = 6.8 × 10–4</p> Signup and view all the answers

    Which weak acid has the highest Ka value based on the provided data?

    <p>Formic acid</p> Signup and view all the answers

    The concentration of water in the acid-dissociation constant expression is constant.

    <p>True</p> Signup and view all the answers

    List one characteristic of weak acids.

    <p>They partially ionize in water.</p> Signup and view all the answers

    The numerical value of _____ is a reflection of the strength of the acid.

    <p>Ka</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser