Nicotinic acid (niacin) is a monoprotic acid with the formula HC6H4NO2. A solution that is 0.012M in nicotinic acid has a pH of 3.39 at 25*C. What is the acid-ionization constant, Ka and pKa for this acid at 25*C?

Question

is the ionization equation:
HC6H4NO2+ H20(l) <>C6H4NO^-(aq) + OH^-(aq)

it doesn't seem right. is it with H3O+ instead?

Answer 1

That is not the ionization reaction.
HC6H4NO2+ H20(l) <>C6H4NO^-(aq) + H3O^+(aq)