Question

So, I had a previous question that asked "The K_a of acetic acid is 1.76x10^-5. Calculate the pH of a buffer prepared by combining 50.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid." It was determined that the pH was about 4.75. Now, the next two questions are what I need help with:

1) Determine the change in pH when 5 mL of 1 M HCl is added to the buffer solution

2) Determine the change in pH when 5 mL of 1 M NaOH is added to the buffer solution

PLEASE show all work