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} -

 

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