Identify conjugate acid-base pairs.

In the subtopic Brønsted-Lowry acids and bases (A-level only), this AQA A-Level Chemistry 7405 learning objective focuses on identify conjugate acid-base pairs. It belongs to Acids and bases (A-level only), so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include conjugate, acid-base, pairs. Brønsted-Lowry acid. means a substance that donates a proton (H+) in a chemical reaction Avoid the mistake of students often confuse conjugate acid-base pairs by misidentifying the acid and its conjugate base or vice versa; instead, to correctly identify conjugate acid-base pairs, remember that a conjugate acid is formed when a base gains a proton (H⁺), and a conjugate base is formed when an acid loses a proton. For example, in the reaction HCl + H₂O ⇌ Cl⁻ + H₃O⁺, HCl is the acid and Cl⁻ is its conjugate base, while H₂O is the base and H₃O⁺ is its conjugate acid For exam answers, when identifying conjugate acid-base pairs, remember that a conjugate acid is formed when a base gains a proton, and a conjugate base is formed when an acid loses a proton