a) For a weak acid (e.g., CH3COOH) that is titrated with a strong base (e.g., NaOH), what species (ions/molecules) are present in the solution at the stoichiometric point?
b) For a weak acid (e.g., CH3COOH) that is titrated with a strong base (e.g., NaOH), what species (ions/mmolecules) are present in the solution at the halfway point in the titration toward the stoichiometric point?