Question

(1) Explain why the equivalence point pH of the HCl-NaOH titration is 7 while the equivalence point pH of the HCl-TRIS titration is 4.6. (2) Write equations for the reaction of the zwitterion of the amino acid glycine with HCl and with NaOH. (3) A student titrated 10.00-mL aliquots of her unknown amino acid solution with standard 0.1521 M NaOH and with 0.0986 M HCl. No inflection points were observed with the HCl titrations, but two were observed in the titration with NaOH. One occurred after 3.29 mL of titrant had been added, and another after a total of 18.61 mL of NaOH had been added. Calculate the concentration of the amino acid.

          (1) Explain why the equivalence point pH of the HCl-NaOH titration is 7 while the equivalence point pH of the HCl-TRIS titration is 4.6.
(2) Write equations for the reaction of the zwitterion of the amino acid glycine with HCl and with NaOH.
(3) A student titrated 10.00-mL aliquots of her unknown amino acid solution with standard 0.1521 M NaOH and with 0.0986 M HCl. No inflection points were observed with the HCl titrations, but two were observed in the titration with NaOH. One occurred after 3.29 mL of titrant had been added, and another after a total of 18.61 mL of NaOH had been added. Calculate the concentration of the amino acid.

Added by Brent R.

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