We’re being asked to identify theoxidation state of carboninCO32– (carbonate ion).

You are watching: Determine the oxidation state of c in co3-2

The rules for oxidation says are as follows:

A. General Rules:

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

2. For an ion (Li+, Al3+, and so on.) O.S. = charge

B. Specific Rules:

1. Group 1A O.S. = +1

2. Group 2A O.S. = +2

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

O.S. = –1 with steels 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 various other compounds

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

Because CO32– is neithera peroxide or superoxide,the oxidation state of each oxygen atom is –2.

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Problem Details

What is the oxidation state of the carbon atom in the carbonate ion, CO32-?

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