Question

What is the pH solution containing 0.30 M HCOOH and 0.52 M HCOOK?

HCOOH_(aq) + H₂O_(l) = H₃O⁺_(aq) + HCOO^-_(aq)

Answer 1

pKa = 3.77

pH = pKa + log ( $\frac{[HCOO^-]}{[HCOOH]}$ )

pH = 3.77 + log ( $\frac{[0.52]}{[0.30]}$ )

pH = 4.01