What would be the initial ph of buffer c

Question

Say for example, that you had prepared a Buffer C, in which you mixed 8.203 g of sodium acetate,NaC₂H₃O₂, with 100.0 mL of 1.0 Maetic acid.

a. What would be the initial pH of Buffer C

b. If you add 5.0mL of 0.5 M NaOH solution to 20.0 mL each of Buffer B( initial pH of Buffer B is 3.92), andBuffer C, Which buffer's pH would change less? explain