How to find the Oxidation Number for Fe in the K4FeCN6 ion

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To find the correct oxidation state of Fe in K4Fe(CN)6 (the Potassium ferrocyanate ion), and each element in the ion, we use a few rules and some simple math. • First, since the Potassium ferrocyanate ion has an overall charge of we could say that the oxidation numbers in K4Fe(CN)6 need to add up to charge on the ion. • How to find the Oxidation Number for C in the CN- ion. (Cyanide ion ion) • • How to find the Oxidation Number for ... • We write the oxidation number (O.N.) for elements that we know and use these to figure out oxidation number for Fe. • • --------- • RESOURCES • How to Find Oxidation Numbers (rules and examples): • How to Find Oxidation Numbers (Rules... • Oxidation Numbers Practice: • Finding Oxidation Numbers Practice Pr... • ---------- • GENERAL RULES • Free elements have an oxidation state of zero (e.g. Na, Fe, H2, O2, S8). • In an ion the all Oxidation numbers must add up to the charge on the ion. • In a neutral compound all Oxidation Numbers must add up to zero. • Group 1 = +1 • Group 2 = +2 • Hydrogen with Non-Metals = +1 • Hydrogen with Metals (or Boron) = -1 • Fluorine = -1 • Oxygen = -2 (except in H2O2 or with Fluorine) • Group 17(7A) = -1 except with Oxygen and other halogens lower in the group • ---------- • ( Potassium ferrocyanate ion)

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