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#buffer solutions

3 public questions tagged with this topic.

Acid, Base, pH

Which of the following pairs of solutions can act as a buffer?

CH₃COOH and CH₃COO⁻Na is the scientifically accurate answer to this question. Within the study of Acid, Base, pH, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of CH₃COOH and CH₃COO⁻Na directly address what is being asked. Among the other options, HCl and NaCl, NaOH and NaCl, and H₂SO₄ and HSO₄⁻ do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2

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pH and Buffer

What happens to the buffering capacity when a buffer is highly diluted?

Decreases correctly describes the effect or change asked about in this question. In pH and Buffer, understanding cause-and-effect relationships is essential for predicting biological outcomes. Decreases occurs because of specific molecular interactions, thermodynamic principles, or regulatory mechanisms that govern this biological process. The other options (Increases, Remains the same, and Becomes zero) describe either opposite effects, effects that occur under different conditions, or changes associated with unrelated processes.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2

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Titration of Amino Acids

The Henderson-Hasselbalch equation is useful in determining:

All of the above correctly identifies the graphical representation, mathematical relationship, or plot parameter described in this question. In Titration of Amino Acids, graphical analysis transforms complex kinetic or biological data into linear relationships that allow precise determination of key parameters. The specific feature described by All of the above is derived from the mathematical transformation of the underlying equation and has a defined physical meaning. The other options (The isoelectric point, The buffering capacity of amino acids, and The charge of amino acids at a given pH) represent different parameters, intercepts, or slopes from either the same or different analytical methods.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 3

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