CHEM 1212 Module Eleven-Chapter 17 Name:____________

Module Eleven: Acid/Base Equilibria Chapter 17	Possible	Actual
A. Idenification of Bronsted-Lowry acids&bases	10
B. Writing Equilibrium Constant Expressions	10
C. Key Terms Chapter 17	10
D. Determination of pH & pOH from concentrations Problems	5
E. Determination of pH of weak acids/bases Problems	10
F. Hydrolysis Reactions	10
G. Common Ion Effect Problem	10
H. Discussion Questions Chapter 17	5
I. Determination of pH of polyprotic acids Problem	10
K. Acid-Base Properties of Salts	5
J. Determination of Kw from Kc	5
M. Multiple Choice Applications -Chapter 17	10
Module Eleven Total:	100

Part A: Identification of Acids and Bases 5 points

Label the acid and the base and their corresponding conjugate pairs for the following reactions:

(1) NH₄ ⁺ + Cl ^1- <=====> NH₃ + HCl

(2) CH₃OH + C^-1- <======> HCl + CH₃O^1-

(3) C₅H₅NH⁺¹ + H₂O <=======> C₅H₅N + H₃O⁺¹

(4) HSeO₄ ^1- + NH₃ <=======> NH₄ ¹⁺ + SeO₄ ^2-

(5) HCO₃ ^1- + OH ^1- <==========> CO₃ ^2- + H₂O

CHEM 1212 M-11 Sample Exam

Part B: Equilibrium Constant Expressions of Acids and Bases 5 points

Write the appropriate equilibrium constant expressions for the following reactions they represent:

a. C₅H₅NH⁺¹ + H₂O çè C₅H₅N + H₃O⁺¹

K_a =

b. NH₃ + H₂O çè NH₄ ¹⁺ + OH ^1-

K_b =

c. H₂CO₃ + H₂O ç=è HCO₃ ^1- + H₃O⁺¹

K_a =

d. HCO₃ ^1- + H₂O ç==è CO₃ ^2- + H₃O⁺¹

K_a2 =

e. C₅H₅N + H₂O ç====è + OH ^1- + C₅H₅N⁺¹

K_b =

f. H₂O + H₂O ç==è H₃O ¹⁺ + OH ^1-

K_w =