general chemistry help 16.24A

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. Ph initial, Ph final

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. PH INITIAL, PH FINAL

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.