Question

Which of the following is an example of a basic salt solution?

• A. CH₃COONa (aq)
• B. NH₄Cl (aq)
• C. ${AlCl}_3\left(aq\right)$
• D. ${\left({NH}_4\right)}_2{SO}_4\left(aq\right)$

Answer 1

The correct option is A

CH₃COONa (aq)

Arrhenius acid: The compound that increases the H⁺ ion concentration in aqueous solution is called Arrhenius acid .

Arrhenius base: The compound that increases the OH⁻ ion concentration in aqueous solution is called Arrhenius base.

Explanation of the correct option:

Option A: The salt which is formed by the neutralization reaction of a strong base and weak acid is known as the basic salt.

• Among all the options, only Sodium acetate$\left(C{H}_{3}COONa\right)$ represents the basic salt because it is formed by the strong base Sodium hydroxide $\left(NaOH\right)$ and weak acid which is Acetic acid$\left(C{H}_{3}COOH\right)$.
• $\underset{\left(\mathrm{Sodium}\right)}{2\mathrm{Na}OH\left(\mathrm{aq}\right)}+\underset{\left(\mathrm{Acetic}\mathrm{acid}\right)}{2{\mathrm{CH}}_3\mathrm{COOH}\left(\mathrm{aq}\right)}\to \underset{\left(\mathrm{Sodium}\mathrm{acetate}\right)}{2{\mathrm{CH}}_3\mathrm{COONa}\left(\mathrm{aq}\right)}+\underset{\left(\mathrm{Hydrogen}\mathrm{gas}\right)}{{\mathrm{H}}_2\mathrm{O}\left(l\right)}$

Explanation of the incorrect options:

Option B: Ammonium chloride is formed by the reaction of a weak base and strong acid so it is acidic in nature.

• $\underset{\left(\mathrm{Ammonia}\right)}{{\mathrm{NH}}_3\left(\mathrm{g}\right)}+\underset{\left(\mathrm{Hydrochloric}\mathrm{acid}\right)}{\mathrm{HCl}\left(\mathrm{aq}\right)}\to \underset{\left(\mathrm{Ammonium}\mathrm{chloride}\right)}{{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{aq}\right)}$

Option C: Aluminum chloride ${\mathrm{AlCl}}_3\left(\mathrm{aq}\right)$ is an acidic salt because its formed from the reaction of a weak base Aluminum hydroxide [Al(OH)₃] and strong acid Hydrochloric acid(HCl).

$\mathrm{Al}{\left(\mathrm{OH}\right)}_3+3\mathrm{HCl}\to {\mathrm{AlCl}}_3+3{\mathrm{H}}_{2}0$

Option D: Ammonium sulphate ${\left({\mathrm{NH}}_4\right)}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)$ also acidic in nature because its formed from the reaction of a weak base Ammonia [NH₃] and strong acid Sulphuric acid (H₂SO₄).

$2{\mathrm{NH}}_3+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\left({\mathrm{NH}}_4\right)}_2{\mathrm{SO}}_4$

Final Answer: Hence, the correct option is (A), Sodium acetate$\left(C{H}_{3}COONa\right)$is an example of a basic salt solution.