If pK1 = 2.34 and pK2 = 9.60, then the isoelectric point pI is?

Q. If pK1 = 2.34 and pK2 = 9.60, then the isoelectric point pI is?

A.            5.87

B.            5.97

C.            3.67

D.            11.94

Answer: 5.97