Question

before adding a sample or solvent to a separatory funnel, what should you have in place? select one or more: a flask under the separatory funnel a stopcock in the closed position a piece of paper under the collection flask a funnel in the top of the separatory funnel a stopper in the top of the separatory funnel

Explanation:

A flask should be placed under the separatory funnel to collect the liquid. The stop - cock must be in the closed position to prevent any leakage of the sample or solvent being added. A stopper in the top of the separatory funnel is needed to prevent spillage and to allow for shaking and mixing during the separation process. A piece of paper under the collection flask is not necessary for the basic operation before adding sample/solvent, and a funnel in the top of the separatory funnel is not a must - have before adding sample/solvent.

Answer:

A. A flask under the separatory funnel
B. A stopcock in the closed position
E. A stopper in the top of the separatory funnel