You Need to Use KH₂PO₄ and K₂HPO₄ to Prepare a Buffer

question 93

Multiple Choice

You need to use KH₂PO₄ and K₂HPO₄ to prepare a buffer with a pH of 7.45. Which of the following ratios of [base]/[acid] is required? For phosphoric acid, (H₃PO₄) , K_a2 = 6.2 × 10^-8.

• A) [base]/[acid] = 1.75
• B) [base]/[acid] = 1.27
• C) [base]/[acid] = 1.24
• D) [base]/[acid] = 0.79
• E) [base]/[acid] = 0.57

---

Definitions:

Skills Course

A training program or workshop designed to teach or enhance specific abilities or competencies.

Preoperative Consent

Informed consent given by a patient before undergoing a surgical or medical procedure, acknowledging understanding of the procedure and its risks.

Head Injury

Trauma to the head that can lead to various medical complications, including concussion, fractures, or brain injury, requiring immediate medical attention.

Ethical Review Board

A committee tasked with reviewing proposed research studies to ensure that they are conducted ethically and do not pose undue risk to participants.