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General Chemistry Principles, Patterns, and Applications, 2011

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d. What is the final pH if 10.00 mL of 0.100 M NaOH are added to 150.0 mL of the buffered<br />

solution?<br />

4. An intermediate used in the synthesis of perfumes is valeric acid, also called pentanoic acid. The pK a of<br />

pentanoic acid is 4.84 at 25°C.<br />

a. What is the pH of a 0.259 M solution of pentanoic acid?<br />

b. Sodium pentanoate is added to make a buffered solution. What is the pH of the solution if<br />

it is 0.210 M in sodium pentanoate?<br />

c. What is the final pH if 8.00 mL of 0.100 M HCl are added to 75.0 mL of the buffered<br />

solution?<br />

d. What is the final pH if 8.00 mL of 0.100 M NaOH are added to 75.0 mL of the buffered<br />

solution?<br />

A N S W E R<br />

1.<br />

2.<br />

3.<br />

a. 1.35 × 10 −3<br />

b. 4.03<br />

c. 3.88<br />

d. 4.30<br />

16.7 End-of-Chapter Material<br />

A P P L I C A T I ON PR OBLEMS<br />

Problems marked with a ♦ involve multiple concepts.<br />

1. The analytical concentration of lactic acid in blood is generally less than 1.2 × 10 −3 M, corresponding to the<br />

sum of [lactate] <strong>and</strong> [lactic acid]. During strenuous exercise, however, oxygen in the muscle tissue is<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

1560

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