Acid-base properties of amino acids- Hi- could you please help me answer this fo

Question

Acid-base properties of amino acids-

Hi- could you please help me answer this for my organic chemistry class. I'm really confused. Please answer A and B. Thank you.

1. The isoelectric point of an amino acid is an intensive property.

a) Knowing that, would you expect to find your inflection point at a different pH value, if you had titrated 0.5 M solution of the same amino acid instead of the 0.1 M solution? Explain.

b) Would your result be different if you had used 50 mL of amino acid solution instead of 20 mL? Explain.

Explanation / Answer

A)

The inflection point will vary with respect to Volume of titrant, but will not vary with respect to pH, since the point is always

pH = pKa + log(A-/HA), so the middle point, A- = HA, independend of concentration

B)

Once again, the pH point of inflection will be the SAME

but the volume will actually change, therefore, if this focuses in the pH value, then the answer is NO

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