Comparing Mass and Volumetric Titrations in the General Chemistry Laboratory

Abstract

Students in the general chemistry laboratory are commonly exposed to volumetric titrations as part of their laboratory curriculum. However, the use of mass burets instead of volumetric burets can save time, expense, and reduce errors. In this laboratory exercise, students are asked to standardize a solution of NaOH(aq) using potassium hydrogen phthalate and determine the acetic acid concentration in vinegar using both techniques. Students are then asked to compare the two approaches. When given a choice in a subsequent laboratory exercise, approximately 75% of the students choose to use the mass approach.