6. A 50.0 mL solution containing 0.500 M carbonic acid (H₂CO₃) is titrated with 0.200
M potassium hydroxide. Calculate the pH of the solution after (a) 0.0 mL, (b) 56.0 mL,
(c) 125.0 mL, (d) 208.0 mL, (e) 250.0 mL, and (f) 305.0 mL of the potassium hydroxide
is added.
$pK_{aH_2CO_3}$ = 6.35; $pK_{aHCO_3^-}$ = 10.33