Which of the following base is strong among the following?
Correct answer: C. CH₃COO⁻ (aq)
- A. NO₃⁻ (aq)
- B. Cl⁻ (aq)
- C. CH₃COO⁻ (aq)
- D. HSO₄⁻ (aq)
Explanation
The strength of a base can be inferred from the strength of its conjugate acid. A strong acid has a weak conjugate base, and a weak acid has a relatively stronger conjugate base. Among the given options, CH₃COO⁻ is the conjugate base of acetic acid, which is a weak acid. This makes CH₃COO⁻ a relatively stronger base compared to the others. NO₃⁻ and Cl⁻ are conjugate bases of strong acids (HNO₃ and HCl, respectively), making them weak bases. HSO₄⁻, while being a conjugate base of a strong acid (H₂SO₄), can still donate a proton, so it is not a strong base.
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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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