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Strong and weak acids and bases Knowledge-Based Practice

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.

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Questions

  1. 1.

    Which of the following pairs consists of a strong acid and a weak base, respectively?

    • A) HCl\text{HCl} and NaOH\text{NaOH}
    • B) HF\text{HF} and KOH\text{KOH}
    • C) HNO3\text{HNO}_3 and NH3\text{NH}_3
    • D) H2SO3\text{H}_2\text{SO}_3 and Ba(OH)2\text{Ba(OH)}_2
  2. 2.

    Which of the following acids produces the strongest conjugate base in aqueous solution?

    • A) HCl\text{HCl}
    • B) HNO3\text{HNO}_3
    • C) HCN\text{HCN}
    • D) HClO4\text{HClO}_4
  3. 3.

    Which of the following equations correctly illustrates the ionization of a weak base in aqueous solution?

    • A) NaOH(aq)→Na+(aq)+OH−(aq)\text{NaOH}(aq) \rightarrow \text{Na}^+(aq) + \text{OH}^-(aq)
    • B) Ca(OH)2(aq)→Ca2+(aq)+2OH−(aq)\text{Ca(OH)}_2(aq) \rightarrow \text{Ca}^{2+}(aq) + 2\text{OH}^-(aq)
    • C) NH3(aq)+H2O(l)⇌NH4+(aq)+OH−(aq)\text{NH}_3(aq) + \text{H}_2\text{O}(l) \rightleftharpoons \text{NH}_4^+(aq) + \text{OH}^-(aq)
    • D) KOH(aq)⇌K+(aq)+OH−(aq)\text{KOH}(aq) \rightleftharpoons \text{K}^+(aq) + \text{OH}^-(aq)
  4. 4.

    Equimolar 0.10 M0.10\text{ M} aqueous solutions of hydrochloric acid (HCl\text{HCl}) and acetic acid (CH3COOH\text{CH}_3\text{COOH}) are prepared at 25 ∘C25\text{ }^\circ\text{C}. Which statement correctly compares these two solutions?

    • A) The acetic acid solution exhibits a higher electrical conductivity than the hydrochloric acid solution.
    • B) Both solutions have identical hydronium ion concentrations and therefore share the same pH value.
    • C) The hydrochloric acid solution has a lower pH and a higher electrical conductivity than the acetic acid solution.
    • D) Neutralizing equal volumes of each solution to the equivalence point requires a greater volume of standard sodium hydroxide for the hydrochloric acid solution.
  5. 5.

    Which statement correctly describes the fundamental difference between a strong acid and a weak acid in aqueous solution?

    • A) A strong acid is always prepared at a higher molar concentration than a weak acid.
    • B) A strong acid molecule contains more ionizable hydrogen atoms than a weak acid molecule.
    • C) A strong acid undergoes neutralization reactions, whereas a weak acid cannot be neutralized by a base.
    • D) A strong acid ionizes virtually completely in water, whereas a weak acid ionizes only partially and establishes a dynamic equilibrium.

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