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Determination of hydrochloric acid and acetic acid in a mixture by potentiometric titration method Technique: Potentiometry Purpose of exercise: The aim of the exercise is to determine the amount of strong and weak acid in the mixture by potentiometric titration. Chemicals • Sodium hydroxide (NaOH), 0.1 M solution • Acetic acid (CH3COOH), 0.1 M solution • Hydrochloric acid (HCl), 0.1 M solution Equipment • Flask: vol. 50 ml; pipets: vol. 5 ml and 10 ml • Microtitrator CerkoLab • Combined glass electrode Determination of CH3COOH and HCl: 1. Into a flask with a capacity of 50 ml, with previously placed with acetic acid and/or hydrochloric acid by supervisor, pour distilled water to the mark. 2. Pour exactly 10 ml of solution of analyte into the measuring cell. Put in combined glass electrode. Turn on the magnetic stirrer. 3. The syringe of the titrator have to be filled with NaOH solution (twice fill and empty syringe with titrant for washing). 4. Set titrator for a pause of 10 seconds, The volume of titrant step for 0.02 ml and a number of steps for 250. Then perform the titration (twice). After finishing your measurements rinse 10-fold titrator’s syringe . Elaboration of the results: 1. Plot the titration curve and determine the endpoints using the two methods given by the supervisor. 2. Calculate the mass of hydrochloric acid and acetic acid in the test sample solution