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

question 81

Multiple Choice

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 10.40?

• 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

---

Definitions:

Material Fact

A fact that is significant or essential to a matter or decision, often influencing the outcome of a legal or financial transaction.

Mislead

To provide false or misleading information that causes someone to form an incorrect belief or conclusion.

Statute of Limitations

A regulation establishing the longest period after an occurrence within which legal actions must be started.

Malpractice

Failure by a professional person, such as a doctor or lawyer, to perform his or her duties competently, resulting in harm to a client or patient.