1 Name of experiment Determination of Acetic Acid Concentration in Vinegar Using Titration Purpose of experiment The purpose of this experiment is to accurately determine the concentration of acetic acid in commercial vinegar. Equipment used The following materials were used: Syringe, 10 mL 10-mL graduated cylinder 25-mL Erlenmeyer flask Electronic balance Disposable pipet Plastic cup, 1.25 oz Vinegar, acetic acid solution Phenolphthalein indicator solution, 1% Sodium hydroxide solution, 1M Plain sheet of white paper Vinegar sample Detailed depiction of experiment Activity 1: Titration of Vinegar with Sodium Hydroxide The exact mass of ~5 mL of vinegar was measured and transferred into the clean 25-mL Erlenmeyer flask. 2 drops of phenolphthalein to the vinegar was added. Approximately 10 mL of 1 M sodium hydroxide (NaOH) was added to the small cup, used to fill the syringe, and recorded to the nearest 0.1 mL. The flask containing the 5.0 mL vinegar was placed on the white sheet of paper. NaOH was added dropwise from the syringe, with constant swirling, until a single drop of NaOH caused a color change that persisted for a few seconds after addition. Once the endpoint had been reached, the total volume of NaOH that was required to reach the endpoint was calculated and recorded. The same steps were repeated for Vinegar Sample 2 and 3.
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- Fall '15