A PH 488 Buffer Was Prepared by Dissolving 0

question 41

Multiple Choice

A pH 4.88 buffer was prepared by dissolving 0.10 mol of benzoic acid (K_a = 6.3 × 10^-5) and 0.50 mol of sodium benzoate in sufficient pure water to form a 1.00 L solution.To a 70.0 mL aliquot of this solution was added 2.00 mL of 2.00 M aqueous HI solution.What was the pH of the new 72.0 mL solution?

• A)2.84
• B)3.16
• C)3.36
• D)4.65
• E)4.90

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Definitions:

Beakers

Laboratory glassware with a wide body and a spout for pouring, commonly used in chemical experiments and procedures.

Class Inclusion Tasks

Cognitive tasks that assess a person's ability to understand that one category or class can include several different subcategories simultaneously.

Seriation

Placing objects in an order or series according to a property or trait.

Linear Thinking

A thought process that follows a straight, direct path to reach a conclusion or solution, often focusing on sequential steps.