What Is the PH of a Buffer Composed of 0

question 31

Multiple Choice

What is the pH of a buffer composed of 0.35 M H₂PO₄^-(aq) and 0.65 M HPO₄^2-(aq) ? (K_a of H₂PO₄^- is 6.2 × 10^-8)

• A) 6.94
• B) 7.21
• C) 7.48
• D) 7.73
• E) 9.06

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Definitions:

Small Intestine

The part of the gastrointestinal tract between the stomach and large intestine that is responsible for most of the digestion and absorption of nutrients.

Stomach

The stomach is a muscular organ located on the left side of the upper abdomen, receiving food from the esophagus and initiating digestion by secreting acid and enzymes.

Large Intestine

The last part of the gastrointestinal tract, which absorbs water and salts, forming and storing feces for elimination.

Duodenum

The first part of the small intestine immediately beyond the stomach, key in digestion and absorption of nutrients.