How to calculate eo?
The first thing to remember is that the algebraic sum of the oxidation stages of the constituent elements of a molecule (or an ion) is equal to its net electrical charge. This means that if the molecule is neutral, the sum of the EO is equal to zero, if it is an ion, the sum is equal to the charge of the ion.
The oxidation number of an ion is the same as the charge of the ion. Examples: N a + has an oxidation number of + 1, and S 2 – has an oxidation number of − 2. The sum of the oxidation numbers in a neutral compound is zero. The sum of the oxidation numbers in a polyatomic ion is the charge of the ion.
When oxygen is part of a peroxide, then its oxidation number is -1. Peroxides are a class of compounds that have an oxygen-oxygen single bond (or O 2-2 peroxide anion). For example, in the molecule of H 2 O 2 (hydrogen peroxide), the oxidation number of oxygen (and its charge) is -1.
The sum of the oxidation numbers of all the elements present in a molecule is zero. – The oxidation number of Hydrogen is (+I).The oxidation number of Oxygen is usually (-II)
The first rule is that the overall oxidation number of a neutral compound is zero. If, for example, the compound NH 3 is considered and the oxidation number of nitrogen is not known, it can be determined from the oxidation number of hydrogen and that of the overall compound.