exp15_ld

exp15_ld - form of this amino acid. (6 pts) acid form base...

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Name Your name Lab Day and Time TA TA's name Room Room C HEMISTRY 21L L EARNING D EVICE EXPT. Identification and Characterization of an Unknown Amino Acid 12 12 For calculations, you must show all of your work and include appropriate units to receive full credit. Answers to the discussion questions should be in the form of complete sentences. 1. An amino acid has both a primary amine group and a carboxylic acid group. Circle and identify each group on the structure below. What does the R group represent? (Hint: How many different naturally occurring amino acids are there? In what ways do these amino acids differ from each other?) (4 pts) N C C R H H H O OH Answer 2. For the amino acid shown above in question 1, draw the acid form, the base form, and the Zwitterion
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Unformatted text preview: form of this amino acid. (6 pts) acid form base form Zwitterion form 3. What does the initial pH of the acid solution (volume titrant = 0 ml) tell you about the amino acid? Explain. (2 pts) Answer 4. In your own words and using paragraph format, describe how to standardize the pH sensor. Why is it necessary to standardize the pH sensor? (3 pts) Answer 5. What is the relationship of the successive equivalence-point volumes in the titration of a polyprotic acid? (2 pts) Answer 6. Derive the relationship between pH and pK a at one-half the equivalence point for the titration of a weak acid with a strong base. (3 pts) Answer...
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