Question detail
In a basic buffer solution, what happens when an acid is added?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Acids and bases (A-level only)
Question
- A. The pH increases significantly
- B. The buffer components react to minimize pH change
- C. The buffer components are completely consumed
- D. The solution becomes neutral
Answer
The buffer components react to minimize pH change
Explanation
When an acid is added to a basic buffer solution, the weak base in the buffer reacts with the added hydrogen ions from the acid, minimizing the change in pH and maintaining the buffer's effectiveness.
Common mistake
Misunderstanding Buffer Action
Students often confuse how basic buffers resist pH change by thinking they only neutralize acids without considering the equilibrium involved.
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.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.