A 20.0 mL sample of 0.687 M HBr is titrated with a 0.216 M NaOH solution. The pH after the addition of 10.0 mL of NaOH is __________.
A. 0.413
B. 0.386
C. 0.163
D. 0.579
E. 0.237
A. 0.413
B. 0.386
C. 0.163
D. 0.579
E. 0.237