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CHM 112
Section 1

Homework Assignment #12
Due February 27, 2006 by 8:05 a.m.

Practice (not to be turned in): Review Questions 15.7

Identify the stronger acid in each pair. Draw the Lewis dot structure for each acid in the pair.

0) HClO3 or HClO2

1) H2SeO4 or H2SO4

2) H2TeO4 or H2SeO4

3) HIO3 or HBrO3

4) HClO4 or H2SO4

5) HNO3 or H2SO4

6) HNO3 or HClO4

7) HNO2 or HNO

8) HBrO2 or HBrO

9) HIO3 or HIO2


Answers:

0) HClO3 or HClO2

Lewis Dot Structure:

 

More oxo type oxygen atoms

Fewer oxo type oxygen atoms

  Stronger acid  


1) H2SeO4 or H2SO4

Lewis Dot Structure:

 

Same number of oxo type oxygen atoms

Se is less electronegative

Same number of oxo type oxygen atoms

S is more electronegative

    Stronger acid


2) H2TeO4 or H2SeO4

Lewis Dot Structure:

 

Same number of oxo type oxygen atoms

Te is less electronegative

Same number of oxo type oxygen atoms

Se is more electronegative

    Stronger acid


3) HIO3 or HBrO3

Lewis Dot Structure:

 

Same number of oxo type oxygen atoms

I is less electronegative

Same number of oxo type oxygen atoms

Br is more electronegative

    Stronger acid


4) HClO4 or H2SO4

Lewis Dot Structure:

 

More oxo type oxygen atoms

Fewer oxo type oxygen atoms

 

Stronger acid

 


5) HNO3 or H2SO4

Lewis Dot Structure:

 

Same number of oxo type oxygen atoms

N is more electronegative

Same number of oxo type oxygen atoms

S is less electronegative

 

Stronger acid

 


6) HNO3 or HClO4

Lewis Dot Structure:

 

Fewer oxo type oxygen atoms

More oxo type oxygen atoms

   

Stronger acid



7) HNO2 or HNO

Lewis Dot Structure:

 

Same number of oxo type oxygen atoms

Same number of oxo type oxygen atoms

 

Same central atom, so the same electronegativity

Same central atom, so the same electronegativity

 

H bonded to the more electronegative O

H bonded to the less electronegative N

 

Stronger acid

 


8) HBrO2 or HBrO

Lewis Dot Structure:

 

More oxo type oxygen atoms

Fewer oxo type oxygen atoms

 

Stronger acid

 


9) HIO3 or HIO2

Lewis Dot Structure:

 

More oxo type oxygen atoms

Fewer oxo type oxygen atoms

 

Stronger acid