A chemist wishes to prepare 250 ml of a buffer that is pH = 4.5.Beginning with 100 mL of 0.12 mol/L acetic acid and a supply of0.10 mol/L NaOH, explain how this could be done. How much 0.20mol/L NaOH must be added to this buffer to raise the pH to 5.1? If the same amount of 0.20 mol/L NaOH were added to 250 mL of deionized water, what would the new pH be?