According to the titration curve of glycine, answer the following questions: a).

ID: 52331 • Letter: A

Question

According to the titration curve of glycine, answer the following questions:

a). At which point does glycine have one positive charge?

b). At which point are half of the amino groups is ionized?

c). At which point the pH of the solution equals to the pKa of the carboxyl group?

d). At which point the pH of the solution equals the pKa of the protonated amino group?

e). At which point glycine has the maximum buffering capacity? What is the pH corresponding to these points?

f). At which point is the carboxyl group is completely titrated?

g). At which point is the predominant species in the solution: +H3N-CH2-COO- ?

h). At which point is glycine a 1:1 mixture of +H3N-CH2-COO- and +H3N-CH2-COOH? What is the pH of the solution at this point?

i). At what pH is the ratio of +H3N-CH2-COO- and +H3N-CH2-COOH 10:1?

j). At what pH is the ratio of the +H3N-CH2-COO- and H2N-CH2-COO- is 1:10?

a) At pka-2.3 and 9.6 it have one positive charge.

b)At the point where pka = pH, it is half ionized.

c) At pH = pka-1 the solution equals the pka of carboxyl groups

d) When the solution is half ionized the solution have pKa= pH.

e) It will have maximum buffering capacity at pH 9.0 to 11.0

f) At pka1 the carboxyl group will be completely titrated.

g) At pka 1

h) At pH = pKa the solution will have the given equilibrium

i) At pH - 2.0

j) At pH = 10

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