conjugate base
What conjugate base means in Chemistry A-Level, as defined for AQA, OCR.
Definitions of conjugate base
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 conjugate base in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The particle remaining after the proton has been donated.
The species an acid becomes when it donates a proton.
Topics that use conjugate base
- Brønsted–Lowry acid–base equilibria in aqueous solution (A-level only) (AQA A-Level)
- Acids, bases and buffers (OCR A-Level)
Related terms
- conjugate acid
- Acid dissociation constant Ka
- acidic buffer
- Amphiprotic
- basic buffer
- Basicity
- Brønsted–Lowry base
- Buffer action against added acid and alkali
Using conjugate base 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 Chemistry questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
A week of Premium from your first lesson · Then the free plan continues · No card, no charge