What Is the PH of a Buffer That Results When

question 71

Multiple Choice

What is the pH of a buffer that results when 0.50 mole of H₃PO₄ is mixed with 0.75 mole of NaOH and diluted with water to 1.00 L? (The acid dissociation constants of phosphoric acid are K_a1 = 7.5 × 10^-3,K_a2 = 6.2 × 10^-8,and K_a3 = 3.6 × 10^-13)

• A) 1.82
• B) 2.12
• C) 6.91
• D) 7.21
• E) 12.44

---

Definitions:

Hypotheses

Proposed explanations for a phenomenon, put forward as bases for further investigation, validation, or refutation.

Amenable

Willing to follow advice or authority; open and responsive to suggestion.

Scientific Test

A methodically organized procedure in science aimed at discovering, demonstrating, or testing a hypothesis or theory.

Demand Characteristics

Cues in an experimental environment that suggest to participants what behavior is expected, desired, or appropriate, potentially influencing their responses.