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In an Experiment, 100 ML of a 0

question 143

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In an experiment, 100 mL of a 0.1 M solution of methionine is titrated using 0.1 M NaOH.Using this information, along with the titration curve shown, which of the following statements is NOT correct? In an experiment, 100 mL of a 0.1 M solution of methionine is titrated using 0.1 M NaOH.Using this information, along with the titration curve shown, which of the following statements is NOT correct? A) At low pHs, the majority of the amino acid present is fully protonated. B) The pK<sub>a</sub> of the protonated amine group seems to be a little greater than 10. C) When the pH reaches the physiological value of 7.4, the carboxylic acid group is essentially deprotonated. D) The K<sub>a</sub> of the -COOH group appears to be between 5 *10<sup>-3</sup> and 8*10<sup>-3</sup>. E) Methionine appears to have a neutral side group, as there seem to be two equivalence points evident on the titration curve.

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