Your supervisor has asked you to prepare 1

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Your supervisor has asked you to prepare 1.00 L of a buffer at pH 6.40 and said all necessary chemicals would be in the fume hood. When you get to the lab you find the following: 250 mL of 0.175 M acetic acid (Ka = 1.76 x 10-5) 350 mL of 0.215 M carbonic acid (Ka = 4.3 x 107) 2.5 M NaOH (stock bottle) 2.5 M HCl (stock bottle)

a) Which acid do you select? Explain.

b) Do you use NaOH or HCl to prepare the buffer? Explain.

c) How much NaOH or HCl do you need to prepare the buffer? Show all your work.