Question detail

Which of the following statements about buffer solutions is true?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Acids and bases (A-level only)

Question

A. Buffers can only be made from strong acids and bases
B. Buffers can only maintain a pH of 7
C. Buffers are ineffective in biological systems
D. Buffers can be made from weak acids and their conjugate bases or weak bases and their conjugate acids

Answer

Buffers can be made from weak acids and their conjugate bases or weak bases and their conjugate acids

Explanation

Buffer solutions are typically composed of weak acids and their conjugate bases or weak bases and their conjugate acids, allowing them to effectively resist pH changes.

Common mistake

Misunderstanding Buffer Applications

Students often confuse the applications of buffer solutions, thinking they only work in specific pH ranges rather than understanding their role in maintaining pH stability in various biological and chemical systems.

To clarify, buffer solutions resist changes in pH when small amounts of acid or base are added. For example, in biological systems, buffers maintain blood pH around 7.4. Recognize that buffers can be effective across a range of pH values, depending on their composition. Always relate the buffer's components to the specific application, such as in metabolic processes or laboratory settings.

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