Fifty milliliters of 0.0500 M carbonic acid (H₂CO₃) are titrated at 25 °C with 0.100…
CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases
Problem
Fifty milliliters of 0.0500 M carbonic acid (H₂CO₃) are titrated at 25 °C with 0.100 M NaOH. Given Ka₁ = 4.3 × 10⁻⁷ and Ka₂ = 4.8 × 10⁻¹¹, what is the closest pH of the solution after exactly 50.0 mL of NaOH have been added (second equivalence point)? Assume volumes are additive.
(a) 9.38
(b) 11.36
(c) 10.32
(d) 12.40