How would you prepare a solution with the pH buffered close to a value of 2.1? Hint: Remember that when you have a buffer solution with equal amounts of conjugate acid and base, Ka = [H3O]+. You’ll
a. Prepare a solution using equal amounts of a weak acid with a pKa close to 2.1 and its conjugate base
b. Add a small amount of a strong acid to a solution of its conjugate base to reach a pH close to 2.1
c. Add a small amount of a weak base with a pKb close to 11.9 to a solution of its conjugate acid to reach a pH close to 2.1
d. Adjust the pH of a solution of a weak acid to 2.1 using a strong acid or base, and then add its conjugate base.