One compound contains an amino group with a pKa of 8.8, and one other ionizablegroup with a pKa of 5to 7.To 100 mL of a 0.2 M solution ofthis compound at pH 8.2 was added 40 mL of a solution of 0.2M HCl. ThepH changed to 6.2. The pKa of the second ionizablegroup is:
A. The pH can not be obtained based on the available information
B. 5.4
C. 5.6
D. 6.0
E. 6.2