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

question 59

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 8.10?

• 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

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Definitions:

Nickel-Cadmium

A type of rechargeable battery that uses nickel oxide hydroxide and metallic cadmium as electrodes.

Nicad Cells

Nickel-Cadmium cells, a type of rechargeable battery known for its robustness and reliability in a wide range of temperatures.

Charged

A state of having an imbalance of electric charge, either positive or negative, which can result in electrostatic attraction or repulsion.

Electric Power

The rate, per unit time, at which electrical energy is transferred by an electric circuit, typically measured in watts.