CHM 2046C      Module Eleven-Chapter 14   Name:____________

 

Module Eleven: Acid/Base Equilibria  McMurry Chapter 14

Possible

Actual

A. Idenification of Bronsted-Lowry/Lewis acids&bases

10

 

B. Writing Equilibrium Constant Expressions Section

10

 

C. Determination of Kw from Kc ; Kb from Ka & Kw ; Show Kb x Ka = Kw  Lecture  

10

 

D.  Determination of pH & pOH from concentrations Problems   

10

 

E.  Determination of pH of weak acids/bases Problems   

10

 

F.  Hydrolysis Reactions             

10

 

G. Common Ion Effect Problem

10

 

4H. Discussion Questions Chapter 17

5

 

I.  Determination of pH of polyprotic acids and/or Buffer Calculation Problem

10

 

J.    Acid-Base Properties of Salts

10

 

K.     Key Terms Chapter 14

10

 

M.   Multiple Choice Applications -Chapter 14                 

25

 

Total:                                                                                           130

Part A: Identification of Acids and Bases                       10 points

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

 

 

 

 (1)         NH4 +       +       Cl 1-      <=====>       NH3       +     HCl

               Acid                     base                  conjugate base conjugate Acid   

 

 

(2)       CH3OH     +       Cl 1-       <======>      HCl       +              CH3O1-

             Acid                     base                  conjugate acid       conjugate base   

 

 

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

               Acid                     base                          conjugate base      conjugate Acid   

 

 

 

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

             Acid                         base                        conjugate acid       conjugate base   

 

 

 

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

               Acid                     base                             conjugate base     conjugate Acid   

Read Chapter 14 Section 14.1 pages 543-546. Look at worked example 14.1 p545 and Worked example 14.2. Do problems 14.1 and 14.2. Also do problems 14.31-14.32 p 584. Answer Section Problems 14.42-14.51 p 586-7

 

 

 

 

CHM 2046C    M-11     Sample Exam

 Part B: Equilibrium Constant Expressions of Acids and Bases        10 points

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

 

a.       C5H5NH+1         +   H2O         çè    C5H5N        +        H3O+1

 

 

           [C5H5N]1 [H3O+1]1

Ka = -------------------------

              [C5H5NH+1]1

 

b.         NH3       +   H2O                  çè         NH4 1+       +         OH 1-        

 

           [NH4 1+]1 [OH 1-]1

Kb = -------------------------

                  [NH3]1

 

c.                   H2CO3         + H2O            ç=è             HCO3 1-      +            H3O+1

 

           [HCO3 1-]1 [H3O+1]1

Ka1 = -------------------------

                  [H2CO3]1

 

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

 

           [CO3 2-]1 [H3O+1]1

Ka2 = -------------------------

                  [HCO3 1-]1

 

 

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

 

           [C5H5N+1]1 [OH 1-]1

Kb = -------------------------

                  [C5H5N]1

 

 

f.          H2O    +         H2O            ç==è           H3O 1+      +      OH 1-

 

                        Kw  =  [H3O 1+] [OH 1-]