Which of the following weak acids has the strongest conjugate base? A) acetic acid, K_a = 1.8 × 10^-5 B) nitrous acid, K_a = 4.5 × 10^-4 C) dihydrogen phosphate ion, K_a = 6.2 × 10^-8 D) hydrocyanic acid, K_a = 4.0 × 10^-10 E) benzoic acid, K_a = 6.3 × 10^-5

Question

Quizplus · Accepted Answer

The strength of a conjugate base is inversely related to the strength of its acid. The weaker the acid (lower K_a), the stronger its conjugate base. Hydrocyanic acid has the lowest K_a value, making its conjugate base the strongest among the options.

Which of the Following Weak Acids Has the Strongest Conjugate