Calculate Oxidation Numbers Video Lessons

Concept: Oxidation Number

# Problem: Assign the correct oxidation number to each species in the redox reaction below.-6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +62PbO2(s) + 2H+(aq) + 2HSO4-(aq) ⇌ PbSO4(s) + 2H2O(l) + O2(g)

###### FREE Expert Solution

The rules for oxidation states are as follows:

A. General Rules:

1. For an atom in its elemental form (Zn, Cl2, C(graphite), etc.)    O.S. = 0

2. For an ion (Li+, Al3+, etc.)                                                       O.S. = charge

B. Specific Rules:

1. Group 1A              O.S. = +1

2. Group 2A              O.S. = +2

3. Hydrogen              O.S. = +1, with nonmetals

O.S. = –1 with metals and boron

4. Fluorine                 O.S. = –1

5. Oxygen                  O.S. = –1 in peroxides (X2O2, X = Group 1A)

O.S. = –1/2 in superoxides (XO2, X = Group 1A)

O.S. = –2 in other compounds

6. Group 7A               O.S. = –1 (except when bonded to O)

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###### Problem Details

Assign the correct oxidation number to each species in the redox reaction below.

-6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6

2PbO2(s) + 2H+(aq) + 2HSO4-(aq) ⇌ PbSO4(s) + 2H2O(l) + O2(g)