Lab Techniques

In scientific research, the reproducibility of an experiment is extremely important. Thus, keeping a lab notebook with detailed procedural recordings along with proper lab techniques helps reproduce experimental findings.

For example, simple measurements, like liquid volume, must be performed using the proper glassware to ensure accuracy. Always measure volume using volumetric glassware, like a volumetric flask, graduated cylinder, or volumetric pipette. The volume is measured at the bottom of the meniscus.

Volume markings on beakers and Erlenmeyer flasks are not accurate and serve as guidelines only. When selecting the volumetric glassware, select the smallest container possible for the volume needed. Volumetric glassware is calibrated either to deliver or to contain.

Containers calibrated to deliver are designed to provide the volume stated with the understanding that a small amount of liquid will remain in the glassware after it is emptied. In this case, there is no need to remove the remaining liquid or more than the desired volume will be emptied. Glassware calibrated to contain will hold and deliver the volume stated but require that the remaining liquid will be poured out so