Lab 14: Titration

Titration setup

Analyte at equivalence point

For our procedure, we used NaOH, vinegar, and phenolphthalein to identify the percent ionization of vinegar. We first obtained a burette and primed it with NaOH to clean and prepare it. Next, we filled the burette to 50 milliliters of NaOH. We then filled an Erlenmeyer flask with 7.0 milliliters of vinegar, 20 milliliters of water, and 4 drops of phenolphthalein. We then measured drops of NaOH into the Erlenmeyer flask until the solution turned barely pink, which was the point of equivalence of the vinegar. We did this twice and measured that it took 22.30 milliliters to turn the substance pink the first time and  22.10 milliliters the second time.

The percent ionization of the vinegar is .489%. This is so low because vinegar only has 1 ionizable proton (Hydrogen), which makes the possibility of it ionizing very, very small.