For the procedure use KHP to standardize NaOH because NaOH is very high can absorb CO2 and water from the atmosphere that NaOH. Experiment to find the acetic acid in vinegar sample by titration. And to determine the reaction of NaOH added. Concentration of NaOH and KHP and %W/W of acetic acid vinegar samples to find the error from standard vinegar sample is -12%.Using data from the graph.