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Hydrolysis of salts

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

Hydrolysis of salts Knowledge-Based Download PDF

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

5 Chemistry practice questions on Hydrolysis of salts. Questions that assess core concepts and understanding.

Questions

  1. 1.

    What is the pH of a 0.10 M aqueous solution of the salt NaA\text{NaA} at 25 °C, given that the acid dissociation constant of the weak acid HA\text{HA} is Ka=1.0×10−5K_a = 1.0 \times 10^{-5} and Kw=1.0×10−14K_w = 1.0 \times 10^{-14}?

    • A) 9.00
    • B) 5.00
    • C) 11.00
    • D) 7.00
  2. 2.

    What is the hydrolysis constant (KbK_b) of the nitrite ion, NO2−\text{NO}_2^-, in an aqueous solution of sodium nitrite at 25 °C, given that Ka(HNO2)=5.0×10−4K_a(\text{HNO}_2) = 5.0 \times 10^{-4} and Kw=1.0×10−14K_w = 1.0 \times 10^{-14}?

    • A) 5.0×10−185.0 \times 10^{-18}
    • B) 5.0×10105.0 \times 10^{10}
    • C) 2.0×10−112.0 \times 10^{-11}
    • D) 2.0×10−102.0 \times 10^{-10}
  3. 3.

    Which of the following net ionic equations correctly represents the hydrolysis reaction that occurs when ammonium chloride, NH4Cl\text{NH}_4\text{Cl}, is dissolved in water?

    • A) NH4+(aq)+H2O(l)⇌NH3(aq)+H3O+(aq)\text{NH}_4^+(aq) + \text{H}_2\text{O}(l) \rightleftharpoons \text{NH}_3(aq) + \text{H}_3\text{O}^+(aq)
    • B) Cl−(aq)+H2O(l)⇌HCl(aq)+OH−(aq)\text{Cl}^-(aq) + \text{H}_2\text{O}(l) \rightleftharpoons \text{HCl}(aq) + \text{OH}^-(aq)
    • C) NH4+(aq)+Cl−(aq)+H2O(l)⇌NH4OH(aq)+HCl(aq)\text{NH}_4^+(aq) + \text{Cl}^-(aq) + \text{H}_2\text{O}(l) \rightleftharpoons \text{NH}_4\text{OH}(aq) + \text{HCl}(aq)
    • D) 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)
  4. 4.

    An aqueous solution of ammonium fluoride (NH4F\text{NH}_4\text{F}) contains both a hydrolyzable cation and a hydrolyzable anion. Given that Ka(NH4+)=5.6×10−10K_a(\text{NH}_4^+) = 5.6 \times 10^{-10} and Kb(F−)=1.4×10−11K_b(\text{F}^-) = 1.4 \times 10^{-11} at 25 °C, which statement correctly describes the acid–base character of this solution?

    • A) The solution is basic because fluoride ion hydrolysis produces a greater concentration of hydroxide ions than hydronium ions.
    • B) The solution is acidic because the acid dissociation constant of the cation is greater than the base dissociation constant of the anion.
    • C) The solution is neutral because the cation and anion are derived from weak species whose hydrolysis effects exactly cancel each other.
    • D) The solution is neutral because neither the ammonium ion nor the fluoride ion is capable of reacting with water.
  5. 5.

    Which of the following salts dissolves in water at 25 °C to produce a basic solution as a result of anion hydrolysis?

    • A) NH4NO3\text{NH}_4\text{NO}_3
    • B) CH3COONa\text{CH}_3\text{COONa}
    • C) KCl\text{KCl}
    • D) CaBr2\text{CaBr}_2