A Buffer May Be Prepared by Mixing a Weak Acid

question 11

Multiple Choice

A buffer may be prepared by mixing a weak acid with a roughly equivalent amount of strong base.Which of the acids below is best for the preparation of a buffer with a pH of 4.00?

• A) sulfurous acid ,H₂SO₃;K_a = 1.7 × 10−²
• B) hydrofluoric acid,HF;K_a = 6.9 × 10−⁴
• C) benzoic acid,HC₇H₅O₂;K_a = 6.6 × 10−⁵
• D) dihydrogen phosphate ion,H₂PO₄−;K_a = 6.2 × 10−⁸
• E) ammonium ion,NH₄⁺;K_a = 5.6 × 10−¹⁰

---

Definitions:

Divorced Mother

A woman who has legally dissolved her marriage and is raising her children on her own or in shared custody arrangements.

Assertiveness Training

A behavioral therapy technique designed to help individuals communicate their needs and desires more effectively, maintaining self-respect and the respect of others.

Eclectic

A therapeutic approach that combines theories and methods from different psychological schools and traditions to tailor treatment to a client's needs.

Psychological Professionals

Trained and licensed individuals who study, diagnose, and treat mental, emotional, and behavioral disorders, including psychologists, psychiatrists, and counselors.