For each solution, calculate the initial and final pH after adding
0.010 mol of HCI.

a. 500.0 mL of pure water

b. 500.0 mL of a buffer solution that is 0.125 M in HC2H3O2 and 0.115 M in NaC2H302

c. 500.0 mL of a buffer solution that is 0.155 M in C2H5NH2 and 0.145 M in C2H5NH3Cl