Combined Science GCSE
The pH scale
What The pH scale means in Combined Science GCSE, as defined for AQA.
Definitions of The pH scale
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
Check what you remember
Read the wording for your board, then hide it and explain The pH scale in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
A numerical way to express the relative acidity or alkalinity of an aqueous solution, using whole numbers only in this specification.
Runs from 0 to 14 and measures how acidic or alkaline an aqueous solution is.
Topics that use The pH scale
- Strong and weak acids (HT only) (AQA GCSE)
- The pH scale and neutralisation (AQA GCSE)
Related terms
- Neutral solutions
- Acids
- Balanced ionic equations for monoprotic and diprotic acids
- Comparing strong and weak acids at equal concentration
- Equilibrium between intact acid molecules and ions
- Hydroxide ions
- Ionic reactions in solution
- Lower H⁺(aq) concentration and less acidic behaviour
Using The pH scale in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Combined Science questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Combined Science GCSE termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge