Final answer:
The size of a separatory funnel used in a lab varies; common sizes are 50 mL, 100 mL, 500 mL, and 1000 mL, with 100 mL being a likely choice when working with glassware of similar volumes.
Step-by-step explanation:
The size of a separatory funnel, often called a sep funnel, used in a laboratory can vary depending on the specific needs of the experiment being performed. Common sizes include 50 mL, 100 mL, 500 mL, and 1000 mL. For example, when working with small volumes or when precision is essential, smaller sep funnels like a 50 mL or 100 mL may be utilized.
In contrast, larger volumes or bulk separations might require the use of 500 mL or 1000 mL funnels. If we consider the equipment listed in the reference information, such as the use of 100 mL graduated cylinders and 100 mL Erlenmeyer flasks, it would suggest that for an experiment requiring coordination with these glassware items, a sep funnel of similar volume, like the 100 mL option, might be the most appropriate choice to maintain consistency and appropriate scaling of volumes within the experiment.