Final answer:
The graph in question represents the titration of an amino acid with a strong base, typically NaOH, using titration curves and indicators to determine the equivalence point.
Step-by-step explanation:
Understanding the Titration of an Amino Acid
The question refers to the process of titrating an amino acid with a strong base. A titration curve is a graph that represents the change in pH as a base, in this case, 0.100 M NaOH, is added to an amino acid solution. Indicators such as methyl red and phenolphthalein are used to signify the end point of the titration. For strong acids like HCl, the equivalence point occurs at a rapid change in pH, indicated by either color change. However, for weak acids like acetic acid, the equivalence point does not align with the color change of methyl red due to its pKa being close to the pKin of the indicator.
When titrating an amino acid, the position of the equivalence point on the titration curve is critical, as it indicates the point at which equal amounts of acid and base have been reacted. The method of titration and the corresponding analysis, such as the van Slyke method, are crucial in the determination of the composition of amino acids in a sample.