The salt giving acidic aqueous solution?
Correct answer: C. NH₄NO₃
- A. CH₃COONa
- B. KNO₃
- C. NH₄NO₃
- D. NaI
Explanation
NH₄NO₃ dissociates into NH₄⁺ and NO₃⁻ in water. The NH₄⁺ ion can donate a proton to water, increasing the concentration of H⁺ ions in the solution, thus making it acidic. CH₃COONa, KNO₃, and NaI dissociate into ions that do not affect the pH significantly, resulting in neutral or basic solutions. Specifically, CH₃COONa forms a basic solution due to the presence of the acetate ion, a conjugate base of a weak acid. KNO₃ and NaI both form neutral solutions as their ions originate from strong acids and bases.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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