The pH of vinegar is 2.40. Calculate the concentration of hydronium ions and hyrdroxide ions in vinegar.
pH = -log(H3O^+)
Substitute and solve for H3O^+.
Then use (H3O^+)(OH^-) = Kw = 1E-14 to solve for OH^-
Substitute and solve for H3O^+.
Then use (H3O^+)(OH^-) = Kw = 1E-14 to solve for OH^-