Acetic Acid and Antacid (13).docx

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UNIVERSITY OF BALAMAND Faculty of Sciences Department of Chemistry Basic Chemistry Laboratory Names: Lara Frangieh ID: A0810408 Anthony Dahdah ID: A0810784 Experiment Title: Applications of Acid-Base Titration A- Determination of the Acetic Acid content in Vinegar B- Titration of Antacids Experiment Week: Week 4 Date: 29/10/09 Submitted to: Dr. Robin Taleb Experiment 3.1: Determination of the Acetic Acid Content of Vinegar 1
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Introduction: Acetic acid is the major acid that is contained in vinegar. According to the standard laws and regulations, every 100 ml of vinegar should contain 4 g of the acetic acid (CH 3 COOH). The quantity of acid could be determined by titration with a sodium hydroxide (NaOH) solution. Although other acids are present, the results are calculated as acetic acid. The aim of this experiment was to calculate the mass percent of the acetic acid in vinegar, and to compare the result with the standard value. Methods : Equipments used: 10 and 20 ml pipettes 200 ml volumetric flask 250 ml Erlenmeyer flask 50 ml cylindrical beaker Burette Chemicals used: Vinegar Distilled water Phenolphthalein indicator NaOH solution ( M b =0.0977M) Reaction: CH3COOH + NaOH CH3COONa + H 2 O 20 ml of vinegar were transferred, using a 20 ml pipette, to a 200 ml volumetric flask, and diluted to 200 ml by adding distilled water until the neck of the volumetric flask. Then, 2 2
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samples of 10 ml of this solution were put into a two 250 ml Erlenmeyer (having the number 1 and 2) by a 10 ml pipette, and diluted by 50 ml of distilled water (using a 50 ml cylindrical beaker) to the Erlenmeyer. Finally, 2 drops of phenolphthalein were added to each Erlenmeyer. A 50 ml burette was rinsed and filled with NaOH solution ( M b =0.0977M). Then, sodium hydroxide was added drop wise to the first solution of the first acetic acid solution ( M CH 3 COOH 1 , 60 ml), and the Erlenmeyer was shaken manually until the color of the solution changed to a permanent pink color. When the color changed to the pink color, the equivalence point occurred. Also, the added volume was recorded V E 1 = 9.8 ml, and
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  • Winter '15
  • Amir Alimohammad
  • Sodium hydroxide, mL of vinegar

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