Multiple Choice
Which of the following molecules could potentially pair with a base in an acid-base reaction?
3. Acids and Bases
Acids and Bases
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In the context of acids and bases, what is the role of a molecule that acts as a buffer?
A
It donates protons to increase the acidity of the solution.
B
It accepts electrons to form a stable complex.
C
It resists changes in pH by neutralizing added acids or bases.
D
It completely dissociates in solution to increase pH.
Verified step by step guidance1
Understand the concept of a buffer: A buffer is a solution that can resist pH changes upon the addition of an acidic or basic component. It typically involves a weak acid and its conjugate base, or a weak base and its conjugate acid.
Identify the role of a buffer: The primary role of a buffer is to maintain a stable pH in a solution by neutralizing small amounts of added acid or base. This is crucial in many biological and chemical systems where pH must remain constant.
Analyze the options given: Evaluate each option to determine which one aligns with the role of a buffer. A buffer does not donate protons to increase acidity, nor does it accept electrons to form a stable complex. It also does not completely dissociate in solution.
Focus on the correct option: The correct role of a buffer is to resist changes in pH by neutralizing added acids or bases. This is achieved through the equilibrium between the weak acid and its conjugate base (or vice versa) in the buffer solution.
Conclude with the correct understanding: A buffer solution is essential for maintaining pH stability in various environments, ensuring that the pH does not fluctuate significantly with the addition of small amounts of acids or bases.
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