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General Chemistry Principles, Patterns, and Applications, 2011

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11. Given the equilibrium system CH 3 CO 2 H(aq) ⇌ CH 3 CO − 2 (aq) + H + (aq), explain what happens to the position of<br />

the equilibrium <strong>and</strong> the pH in each case.<br />

a. Dilute HCl is added.<br />

b. Dilute NaOH is added.<br />

c. Solid sodium acetate is added.<br />

12. Given the equilibrium system CH 3 NH 2 (aq) + H 2 O(l) ⇌ CH 3 NH + 3 (aq) + OH − (aq), explain what happens to the<br />

position of the equilibrium <strong>and</strong> the pH in each case.<br />

a. Dilute HCl is added.<br />

b. Dilute NaOH is added.<br />

c. Solid CH 3 NH 3 + Cl − is added.<br />

A N S W E R<br />

1.<br />

2.<br />

3.<br />

4.<br />

5.<br />

6.<br />

7.<br />

8.<br />

9.<br />

10.<br />

11.<br />

a. shifts to left; pH decreases<br />

b. shifts to right; pH increases<br />

c. shifts to left; pH increases<br />

12.<br />

N U M E R I C A L PR O BL E M S<br />

1. Calculate the pH of each solution.<br />

a. A volume of 25.0 mL of 6.09 M HCl is added to 100.0 mL of distilled water<br />

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

Saylor.org<br />

1519

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