Chemistry: titration of an unknown amino acid

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SUMMARY

The discussion focuses on the titration of an unknown amino acid solution using standard 0.1521M NaOH and 0.0986M HCl to determine the concentration of the amino acid. The student performed titrations with 18.61mL of NaOH and 3.28mL of HCl, applying the equation M1V1=M2V2. It was concluded that the amino acid exists in both its protonated (A) and deprotonated (A-) forms, which must be considered when calculating the concentration.

PREREQUISITES
  • Understanding of titration techniques
  • Knowledge of molarity and the M1V1=M2V2 equation
  • Familiarity with acid-base reactions
  • Basic concepts of amino acid structure and behavior in solution
NEXT STEPS
  • Study the principles of acid-base titration in detail
  • Learn about the properties of amino acids and their ionization
  • Explore the calculations involved in titration curves
  • Investigate the use of pH indicators in titration
USEFUL FOR

Chemistry students, particularly those studying analytical chemistry, and anyone involved in laboratory work related to amino acids and titration methods.

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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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