If the titration curve shown below is for the amino acid glycine,at which point in the curve is the pI?
A) A
B) B
C) C
D) D

Question

If the titration curve shown below is for the amino acid glycine,at which point in the curve is the pI? 
A) A 
B) B 
C) C 
D) D

Quizplus · Accepted Answer

The pI (isoelectric point) is the pH at which the molecule has a net zero charge. At this point, the molecule neither donates nor accepts any protons. On the titration curve, the pI is located at the midpoint of the plateau region, where the buffering capacity is the highest. In the glycine titration curve, this plateau region is observed between pH 5.97 and 9.78, with the midpoint occurring at approximately pH 7.38, which is at point C. Therefore, the pI of glycine is approximately 7.38.

If the Titration Curve Shown Below Is for the Amino