Question

You are asked to prepare 500. mL of a 0.150 M acetate buffer atpH 4.90 using only pure acetic acid (MW=60.05 g/mol, pKa=4.76),3.00 M NaOH, and water. Answer the following questions regardingthe preparation of the buffer.

1. How many grams of acetic acid will you need to prepare the500 mL buffer? Note that the given concentration of acetate refersto the concentration of all acetate species in solution.

2. What volume of 3.00 M NaOH must you add to the acetic acid toachieve a buffer with a pH of 4.90 at a final volume of 500 mL?(Ignore activity coefficients.)