A Phosphate Buffer Solution (25

question 20

Multiple Choice

A phosphate buffer solution (25.00 mL sample) used for a growth medium was titrated with 0.1000 M hydrochloric acid. The components of the buffer were sodium monohydrogen phosphate and sodium dihydrogen phosphate. The first endpoint occurred at a volume of 10.32 mL; the second occurred after an additional 18.62 mL was added, for a total volume of 28.94 mL. What was the approximate ratio of HPO₄^2 to H₂PO₄^ in the buffer?

• A)1:1
• B)4:5
• C)5:3
• D)5:4
• E)3:5

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Definitions:

Lower Leg Orthotic

A supportive device worn on the lower leg to aid in mobility, support weak muscles, or correct deformities.

Physical Capabilities

The extent of a person's physical strength, endurance, flexibility, and overall ability to perform activities or tasks.

Sensory Acuity

The ability of the sensory systems to accurately detect and process stimuli.

Analogy

A comparison between two things that are similar in some respects, often used to explain or clarify a concept or a process.