according to the titration curve of glycine shown above, answer the following qu

ID: 886864 • Letter: A

Question

according to the titration curve of glycine shown above, 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 completely titrated?

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

h) At which point is glycine 1:1 mixture of +H3N-CH2-COO- and +H3C-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- 1:10?

a) At pka-2.3 ( COOH group will be neutral and NH3+ )and 9.6 it have one positive charge.

b)the amino acid is half neutralized at the point where pH become equal to pKa.

c) When pH = pka1 = 2.34 , the solution equals the pka of carboxyl groups

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

e) The pH range for buffer range = 9-11.

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

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