Assuming Equal Concentrations of Conjugate Base and Acid, Which One

question 7

Multiple Choice

Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is suitable for making a buffer solution with an optimum pH of 4.6-4.8

• A) CH₃COO₂Na / CH₃COOH (K_a = 1.8 * 10^-5)
• B) NH₃ / NH₄Cl (K_a = 5.6 *10^-10)
• C) NaOCl / HOCl (K_a = 3.2 * 10^-8)
• D) NaNO₂ / HNO₂ (K_a = 4.5 * 10^-4)
• E) NaCl / HCl

---

Definitions:

Ginseng

A medicinal plant root known for its immune-boosting and energy-enhancing properties, commonly found in East Asia and North America.

Animal-Assisted Therapy

The use of specifically selected animals as a treatment modality in health and human service settings.

Physical Decline

The gradual decrease in physical capabilities and functions, often associated with aging or chronic conditions.

Aromatherapy

The use of plant materials and aromatic plant oils, including essential oils, for psychological and physical well-being.