For each of the following solutions, calculate the initial pH and the final pH after adding 0.005 mol of NaOH.
Part A 300.0 mL of pure water Express your answers using two decimal places separated by a comma.
Part B 300.0 mL of a buffer solution that is 0.215 M in HCHO2 and 0.295 M in KCHO2 Express your answers using two decimal places separated by a comma.
Part C 300.0 mL of a buffer solution that is 0.275 M in CH3CH2NH2 and 0.245 M in CH3CH2NH3Cl Express your answers using two decimal places separated by a comma.