Redox reactions are fundamental in chemistry, involving the transfer of electrons between species. Understanding how to balance these reactionsis crucial for electrochemistry, corrosion studies, and many industrial processes. The key is tracking electron flow and ensuring conservation of mass and charge.

Oxidation Numbers

Oxidation numbers help track electron transfer. Key rules: free elements have oxidation number 0, monatomic ions have oxidation number equal to their charge, hydrogen is +1 (except in metal hydrides), oxygen is -2 (except in peroxides), and the sum of oxidation numbers in a compound equals the compound's charge.

• Free elements: oxidation number = 0
• Monatomic ions: oxidation number = ion charge
• Hydrogen: +1 (except in metal hydrides where it's -1)
• Oxygen: -2 (except in peroxides where it's -1)
• Sum of oxidation numbers = compound charge

Sources & References