Question

Calculate the volume of 2 M acetic acid needed to prepare 50 ml of 0.1 M acetate buffer.

Answer 1

Are you adding NaOH to acetic acid or are you adding sodium acetate to acetic acid.

Answer 2

I'm adding NaOH

Answer 3

......CH3COOH + OH^-==> CH3COO^- + H2O
If we started with 2.5 mL of 2M CH3COOH that would be 2.5 x 2 = 5 mmoles. Then we add 2.5 mmoles NaOH which gives us at equilibrium 2.5 mmoles acetate and 5.0-2.5 = 2.5 mmoles CH3COOH.
Total is 2.5 mmoles CH3COOH + 2.5 mmoles CH3COONa = 5 mmoles total/50 mL = 0.1M