chemistry problem amount of substance

1.) Propanoic acid was reacted with propan-1-ol to form an ester and H2O. HCl was added and the reaction mixture sealed in a container, left to reach equilibrium for a week. Products then mixed with water and the solution was titrated against NaOH. How would you determine the amount of moles of propan-1-ol at equilibrium?

How would you determine the moles of propanoic acid? Suggest a procedure.