Iron is hiding something. In iron(II) chloride it carries a charge of +2, but in iron(III) chloride it shifts to +3. Same element, two different identities two completely different compounds. The number that reveals this hidden charge is called the oxidation state. Once you learn to assign and calculate oxidation states, Roman numerals in compound names will never be mysterious again you will know exactly what they mean and how to use them. Today's session unlocks that power. Oxidation states: where algebra meets chemistry!
16/05/2026, 13:40:24
