# chemistry

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What is the oxidation number of PO4 in the compound Ca3(PO4)2? how do you get it?

• chemistry -

You know the PO4 has a net charge of -3

by the rules, O is -2, so 4 of those makes O carry a total of -3

Finally, the rules state then the sum of the oxidation numbers equals the charge...

X-8=-3
solve for X

• chemistry -

6 years later

• chemistry -

-3

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