Given that carbonic acid, H ₂ CO ₃ , has a pKa1 = 6.37 and a pKa ₂ = 10.33, answer the following.
(a) If you wanted to make a pH 7 buffer solution starting with NaHCO ₃ (aq), would you add 0.10 M HCl or 0.10 M NaOH?
answer: 0.10 M HCl

(b) If you began with 6.5 mL of 0.45 M NaHCO ₃ , how many mL of your choice from (a) would you need to add to get a pH 7 buffer?
mL