1) if we add 0.50 mL of 0.087 M HCL to the solution in part A . How many moles of acetic acid , sodium acetate, and NaOH will be present after the reaction is done? Part A states : A buffer solutions contains .120 M acetic acid and 0.150 M sodium acetate. How many moles of acetic acid and of sodium acetate are present in 50.0 ml of solution ? = 0.0075 moles.