Lab 14: Titration
Lab Setup (Photo) Analyte at the Equivalence Point (Photo) Summary of Procedure Setup: We filled a burette with sodium hydroxide, a strong base, and carefully controlled its flow into an Erlenmeyer flask that was being stirred by a magnetic stir bar. This flask contained a mixture of 20 mL of water, about 7.5 mL of vinegar ( a weak acid), and several drops of the indicator phenolphthalein. We watched the impact the flow of base had on the solution in the flask, watching for the tell-tale flash of pink; we were supposed to turn the liquid a soft pink color. In this lab we performed two trials . On our first trial we added a few drops too many, causing the liquid to turn a shade of hot pink. Our second trial yielded slightly better results; after following the same steps, we cautiously dripped in the base, watching to see how long the pink color lingered after each drop. This t...
