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Strong and weak acids and bases

Chemistry • Acid–Base Concepts • Knowledge-Based • 5 questions

Strong and weak acids and bases Knowledge-Based Download PDF

Chemistry · Acids & Bases · Chemistry · Acid–Base Concepts

5 Chemistry practice questions on Strong and weak acids and bases. Questions that assess core concepts and understanding.

Questions

  1. 1.

    In an aqueous solution of a weak monoprotic acid, HAHA, with an initial concentration of 0.10 M at 25 °C, which of the following correctly describes the relationship among the equilibrium molar concentrations of the species?

    • A) [HA]>[A−]≈[H3O+]>[OH−][HA] > [A^-] \approx [H_3O^+] > [OH^-]
    • B) [H3O+]≈[A−]>[HA]>[OH−][H_3O^+] \approx [A^-] > [HA] > [OH^-]
    • C) [HA]=[A−]>[H3O+]>[OH−][HA] = [A^-] > [H_3O^+] > [OH^-]
    • D) [A−]>[HA]>[OH−]≈[H3O+][A^-] > [HA] > [OH^-] \approx [H_3O^+]
  2. 2.

    As an aqueous solution of a weak monoprotic acid is progressively diluted with water at a constant temperature, how do its acid dissociation constant (KaK_a) and its percent ionization change?

    • A) Both KaK_a and percent ionization increase.
    • B) KaK_a increases, while percent ionization remains constant.
    • C) KaK_a remains constant, while percent ionization increases.
    • D) KaK_a remains constant, while percent ionization decreases.
  3. 3.

    Which of the following acids produces the conjugate base with the weakest tendency to accept a proton in aqueous solution?

    • A) CH3COOH\text{CH}_3\text{COOH}
    • B) HF\text{HF}
    • C) HCl\text{HCl}
    • D) HCN\text{HCN}
  4. 4.

    Which of the following statements correctly describes the fundamental difference between strong bases and weak bases in aqueous solution?

    • A) Strong bases dissociate completely into hydroxide ions and cations, whereas weak bases accept protons incompletely in a reversible equilibrium with water.
    • B) Strong bases possess high aqueous solubility, whereas all weak bases are completely insoluble substances that form precipitates.
    • C) Strong bases produce hydrogen ions when dissolved in water, whereas weak bases generate hydroxide ions.
    • D) Strong bases react exclusively with weak acids, whereas weak bases neutralize strong acids only.
  5. 5.

    Which of the following statements correctly compares equimolar aqueous solutions of a strong monoprotic acid and a weak monoprotic acid at the same temperature?

    • A) The weak acid solution exhibits higher electrical conductivity because it contains a greater number of dissolved particles.
    • B) The strong acid solution has a lower pH because it ionizes completely into hydronium ions.
    • C) The weak acid solution requires a smaller volume of standardized strong base to reach the equivalence point.
    • D) The strong acid solution has a smaller acid-dissociation constant (KaK_a) due to the high stability of its conjugate base.