A buffer solution is made by adding 1.56 g of sodium hydroxide to 400 cm3 of a 0.600 mol dm-3 solution of propanoic acid at 25 ∘C25\text{ }^\circ\text{C}25 ∘C. Calculate the pH of this buffer solution. Give your answer to 2 decimal places. For propanoic acid, Ka=1.35×10−5 mol dm−3K_a = 1.35 \times 10^{-5}\text{ mol dm}^{-3}Ka=1.35×10−5 mol dm−3 at 25 ∘C25\text{ }^\circ\text{C}25 ∘C.
