Question

1. prepare a buffer solution by using acetic acid and sodium acetate.2. prepare M/40 NAOH solution.

Answer 1

1. You don't say what the pH must be. Decide that, use pH = pKa + log(base)/(acid) and calculate the base/acied ratio, then convert to mass.
2. How many mols NaOH do you need?
mols NaOH = M x L = ?
mols = grams/molar mass.Solve for grams.