Calculate the pH of 0.300 L of a 0.500 M NaHSO3 / 0.300 M Na2SO3 buffer before and after the addition of the following solutions. Assume that the volume remains constant.
1. before addition pH
2. adding 5.0mL of 2.0M HCl
3. After adding 5.0mL of .1M NaOH