A Solution Is Prepared by Dissolving 0

question 91

Multiple Choice

A solution is prepared by dissolving 0.23 mol of butanoic acid and 0.27 mol of sodium butanoate in water sufficient to yield 1.00 L of solution.The addition of 0.05 mol of HCl to this buffer solution causes the pH to drop slightly.The pH does not decrease drastically because the HCl reacts with the ________ present in the buffer solution.The K_a of butanoic acid is 1.36 × 10^-3.

• A) H₂O
• B) H₃O⁺
• C) butanoate ion
• D) butanoic acid
• E) This is a buffer solution: the pH does not change upon addition of acid or base.

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Definitions:

Single Circuit

Refers to a type of blood circulation system where the blood passes through the heart once in a complete circuit of the body, typical of fish.

Circulatory System

The system comprising the heart, blood vessels, and blood, responsible for transporting nutrients, oxygen, and waste products throughout the body.

Fish

Aquatic, gill-bearing animals that lack limbs with digits, often covered with scales, and inhabitant of waters worldwide.

Partially Separated Circuits

Electrical circuits that share some, but not all, connections or components, allowing for partially independent operation.