Glycine has pKa values of 2.34 and 9.60. Therefore, glycine will exist predominately as a zwitterion in an aqueous solution with the following pH.
A. pH = 2.34 and pH = 9.60
B. pH > 2.34 and pH < 9.60
C. pH < 2.34 and pH > 9.60
D. pH = 2.34 and pH > 9.60

Option (B) pH > 2.34 and pH < 9.60.

Explanation:

In a zwitterionic structure, overall negative charge should be 0.

It means, for glycine, the two functional groups e.g. and -COOH should bear equal and opposite charges in it's zwitterionic structure.

of -COOH (in glycine) = 2.34

Therefore, at a pH > 2.34, -COOH group of glycine exists predominantly as .

of    (in glycine) = 9.60

Therefore, at a pH < 9.60,    group of glycine exists predominantly as .

Hence we can say that at 2.34 < pH < 9.60, glycine exists predominantly in zwitterionic form due to presence of and in equal amount.

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?