A buffer solution is prepared by adding 2.20 g of solid sodium hydroxide to 500 cm3 of a 0.350 mol dm-3 solution of methanoic acid (HCOOH\text{HCOOH}HCOOH) at 25 ∘C25\text{ }^\circ\text{C}25 ∘C.
Calculate the pH of this buffer solution. Give your answer to 2 decimal places.
For methanoic acid, Ka=1.78×10−4 mol dm−3K_a = 1.78 \times 10^{-4}\text{ mol dm}^{-3}Ka=1.78×10−4 mol dm−3 at 25 ∘C25\text{ }^\circ\text{C}25 ∘C.
