IB Chemistry - Oxidation

IB Chemistry home > Syllabus 2025 > Redox processes > Redox equations

Redox is a term that stands for 'Reduction and Oxidation'. In any reduction process electrons are provided and, logically, they must be picked up by a different species.

In other words, reduction always take place in conjunction with oxidation during redox chemical reactions (as opposed to processes occurring at electrodes). This chapter looks at redox equations and how to construct and deconstruct them.

Syllabus reference

Reactivity 3.2.2 - Half-equations separate the processes of oxidation and reduction, showing the loss or gain of electrons.

  • Deduce redox half-equations and equations in acidic or neutral solutions.


Tools and links

  • Tool 1, Inquiry 2 - Why are some redox titrations described as “self-indicating”?

In Chapter 9.2