How Many Moles of Sodium Acetate Must Be Added to 500

question 9

Multiple Choice

How many moles of sodium acetate must be added to 500 mL of 0.25 M acetic acid solution to produce a buffer with a pH of 4.94? The pK_a of acetic acid is 4.74. You can neglect the change in volume when sodium acetate dissolves in the acetic acid solution.

• A)0.011 moles
• B)0.021 moles
• C)0.125 moles
• D)0.198 moles
• E)0.206 moles

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Definitions:

Marginal Cost

The cost of producing one additional unit of a good or service.

Marginal Cost Curve

A graphical representation showing how the cost of producing one additional unit of a good changes as the production level varies.

Total Variable Costs

The total of all costs that vary with the level of output, including costs for raw materials, labor, and energy, in the production process.

Average Fixed Costs

Fixed costs divided by the quantity of output produced, indicating the fixed cost per unit of output.