Additional Buffer/pH problems

1. You have .5 liter of an acetic acid buffer (.8M) at maximum buffering capacity. To it, you add .1 moles of HCl. What is the new pH?

2. You have .5 liter of an acetic acid buffer (.8M) at maximum buffering capacity. To it, you add .1 moles of salt. What is the new pH?

(pKa of acetic acid is 4.76)