Arkansas State University 
Department of Chemistry
and Physics
CHEM2004
Exam 2a

CHEM2004                                                               Name_________________________

Exam 2a                                                                    Fall 2006

 

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1.         Determine the category of acidity for each of the following ions:            (10 points)

 

Tc + 5   -

 

Pm + 3 -

 

Ti + 2 -

 

Ga + 3 -

 

Ag + -

  

2.         Calculate pKb for each of the following:                     (6 points)

 

CO 3 - 2  - 

  

FeO 4 - 2  -

  

SbO 6 - 7 -

  

3.         Classify each oxoanion in question 2 in terms of basicity.            (6 points)

 

CO 3 - 2  - 

 

FeO 4 - 2  -

  

SbO 6 - 7 -

 

4.         Using the quick estimate method, determine the basicity category for:    (4 points)

 

WO 4 - 2 -

OsO 6 - 4 -

  

5.         Calculate the pH for each ion below and tell the expected form in normal water and in acid waters.                                  (12 points)

 

pH                               normal water                       acid water

 

Li +  -

 

Ce + 4 -

 

Pd + 2 -

 

Mn + 7 -

 

Work space:

 

6.         Determine if the following compounds are soluble or insoluble, labeling the acid/base strength of the cation and anion.      (12 points)

         Cu2CrO4

         VAlO 4