Which of the following acids (listed with K_a values) and their conjugate base would be the best choice to make a buffer with a pH of 2.34? A) C₆H₅COOH, K_a = 6.5 × 10^-5 B) HF, K_a = 3.5 × 10^-4 C) HClO, K_a = 2.9 × 10^-8 D) HCN, K_a = 4.9 × 10^-10 E) HClO₂, K_a = 1.1 × 10^-2

Question

Quizplus · Accepted Answer

To make a buffer with a pH of 2.34, we need an acid with a pKa value close to 2.34. The conjugate base of that acid will then serve as the buffer. Considering the given options, the only acid with a pKa value close to 2.34 is HClO2, with a pKa of 1.2. Its conjugate base (HClO2-) will serve as the buffer. Therefore, the best choice is E, HClO2 and HClO2-.

Which of the Following Acids (Listed with Ka Values) and Their

Which of the Following Acids (Listed with K_a Values) and Their