A buffer is made up of 355 mL each of 0.200 M NaHCO3 , and 0.134 M Na2CO3 . Assuming that volumes are additive , calculate
A. The pH of the buffer
B. The pH of the after the addition of 0.0300 mol of HCl to .710 L of buffer
C. The pH of the after the addition of 0.0300 mol of KOH to .710 L of buffer