First, check whether the separatory funnel leaks, that is, hold the plug with one hand, hold the lower end of the funnel all the time and fill it with water, and then turn it upside down to see if it leaks.

Then put the two liquids into a separatory funnel, oscillate evenly, and put them on the iron ring of the iron frame. After the liquid is stratified, the lower liquid is discharged from below and the upper liquid is poured out from above. Pay attention to open the plug at the top to let the air circulate.

There is a piston in the neck of the separating funnel, which is an important reason why it is different from the ordinary funnel and the long-necked funnel, because there is no piston in the neck of the ordinary funnel and the long-necked funnel, and the liquid cannot be flexibly controlled. When the liquid in the separating funnel flows downward, the piston can control the flow rate of the liquid. If the reaction is to be terminated, the piston should be closed tightly, so that the dripping of liquid can be stopped immediately.