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Carbon has an oxidation number of +4 in both carbonate and bicarbonate. Oxygen as usual has an oxidation number of -2, and hydrogen has an oxidation number of +1. Therefore, the ion CO3-2 has six negative charges from oxygen partly balanced by four positive changes from carbon for a net of -2, and HCO3-1 has six negative charges from oxygen partly balanced by one positive from hydrogen and needs for plus four from carbon for an overall value of -1.

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10y ago
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11y ago

Carbonate is CO32- ion and the oxidation numbers are +4 for carbon and -2 for each oxygen.

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Q: What is the oxidation number of carbon in carbonate?
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