Explain qualitatively how basic buffers resist pH change.

In the subtopic Buffer action (A-level only), this AQA A-Level Chemistry 7405 learning objective focuses on explain qualitatively how basic buffers resist pH change. 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 basic buffer, pH, buffer. Basic buffer. means a solution that resists changes in pH upon the addition of small amounts of acid or base, typically composed of a weak base and its conjugate acid Avoid the mistake of students often confuse how basic buffers resist pH change by thinking they only neutralize acids without considering the equilibrium involved; instead, to explain how basic buffers resist pH change, remember that they consist of a weak base and its conjugate acid. When an acid is added, the weak base reacts with the hydrogen ions, minimizing pH change. For example, in a buffer solution of ammonia (NH3) and ammonium chloride (NH4Cl), the reaction can be represented as: NH3 + H+ ⇌ NH4+. This shows how the weak base (NH3) reacts with added H+ ions, maintaining the pH For exam answers, when explaining how basic buffers resist pH change, focus on the equilibrium between the weak base and its conjugate acid. This helps illustrate how they maintain a stable pH when acids or bases are added