Chemistry: titration of an unknown amino acid

AI Thread Summary
To determine the concentration of the unknown amino acid, the student titrated 10.00 mL of the solution with 0.1521 M NaOH and 0.0986 M HCl, using 18.61 mL and 3.28 mL, respectively. The key equation M1V1 = M2V2 was applied, but the student encountered discrepancies in the calculated amino acid concentration. It's important to consider the reactions occurring during titration with both strong acid and base, as the amino acid exists in both protonated (A) and deprotonated (A-) forms. Understanding these reactions is crucial for accurate concentration calculations. The discussion emphasizes the need to analyze the titration data carefully to resolve the concentration issue.
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Homework Statement


A student titrated 10.00-mL aliquots of her unknown amino acid solution with standard 0.1521M NaOH (18.61mL) and with 0.0986M HCl (3.28mL). Calculate the concentration of the amino acid. Assume the amino acid contains both the A & A- forms of the amino acid.


Homework Equations


M1V1=M2V2


The Attempt at a Solution


I used the above equation but got different M1 for the amino acid concentration.
 
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You wre already given a hint in the question - you start with a mixture of two forms of aminoacid. Think what reactions take place when you titrate with strong acid and with strong base.

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