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Kayla PeterpaulPartner: Amanda JavierDetermination of the Dissociation Constant of a Weak Acid26 March 2018CHEM1204.31Dr. Jia MaChemistry DepartmentFairleigh Dickinson UniversityAbstractIn this experiment, the ionization constant of an unknown weak acid was determined by titrating it with a strong base (NaOH solution). This was accomplished by using the titration curve based on the data. The concentration of the unknown acid was also determined by using the base at the equivalence point, its molarity, and the volume of acid used. The results show that the ionization constant for the unknown acid was 5.38 and the concentration was .098M. ExperimentalPage 1 of 8 Experiment 25
Chemicals:●Potassium hydrogen phthalate (KHP) CAS: 877-24-7●Standard buffer solution CAS: 7778-77-0●Unknown solution of a weak acid (~0.1 M)●0.1 M NaOH or 19 M NaOH CAS:1310-73-2●Phenolphthalein indicator solution CAS: 77-09-8●Buffer solution pH= 4.0 CAS: 127-09-3Apparatus:●pH meter with electrodes●Balance FX-300i SN: 15632089●150 mL beakers (4)●Buret●1 pt plastic bottle with plastic lid●Hot plate PC-420D 15355224●600 mL Erlenmeyer flask●250 mL Erlenmeyer flasks (3)●25 mL pipet and pipet bulb●Buret clamp and ring stand●Weighing paper●Wash bottleProcedure:In Part B of the experiment, a titration between KHP and an NaOH solution was Page 2 of 8 Experiment 25