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MCAT Chemical and Physical Foundations of Biological Systems Flashcards: 5a Titration Buffers

Study 5a Titration Buffers in MCAT Chemical and Physical Foundations of Biological Systems with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

What is the definition of a buffer in aqueous acid–base chemistry?

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ANSWER

A solution that resists pH change upon small acid/base addition. Buffers maintain stable pH by neutralizing small amounts of added acid or base through reversible reactions involving weak acids/bases and their conjugates.

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MCAT Chemical and Physical Foundations of Biological Systems: Foundational Concepts

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This deck focuses on 5a Titration Buffers, giving you a quick way to review the definitions, rules, and examples that matter most for MCAT Chemical and Physical Foundations of Biological Systems.

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Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Practice questions

1 of 45Practice questions for this set
A 50.0 mL sample of 0.100 M acetic acid (HA\mathrm{HA}) is titrated with 0.100 M NaOH. The reaction is HA+OH−→A−+H2O\mathrm{HA + OH^- \rightarrow A^- + H_2O}, and pKa(HA)=4.76pK_a(\mathrm{HA})=4.76 (25°C). At the equivalence point, essentially all initial HA\mathrm{HA} has been converted to A−\mathrm{A^-}, and the pH is determined primarily by base hydrolysis: A−+H2O⇌HA+OH−\mathrm{A^- + H_2O \rightleftharpoons HA + OH^-}. For acetate, Kb=Kw/KaK_b=K_w/K_a with Kw=1.0×10−14K_w=1.0\times10^{-14}. Which statement best explains why the pH at the equivalence point is expected to be greater than 7? Constants provided: pKa=4.76pK_a=4.76; Kw=1.0×10−14K_w=1.0\times10^{-14}.
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