Tell how you would prepare an acetic acid/acetate buffer solution having apH of 3.79. Ka for acetic acid = 1.85 x 10-5
Use the H-H equation I just derived for you. Next, decide how much want to prepare. Make it easy to prepare 1 L.
3.79 = pKa + log (b/a)
Solve for b/a.
Assume you want to a to be 1M, the solve for b = ?*a. That gives b.
Knowing you want a to be 1M and you want 1 L, calculate grams acid and grams of say sodium acetate. I estimate you can use 60 g HAc and about 9 g NaAc but those aren't exact numbers.