If liquid spits out the stopcock, try to allow it to drain back into the funnel. With highly volatile solvents (like diethyl ether), a definite "swoosh" can be heard upon venting, and small amounts of liquid may even sputter out the stopcock. Pressure builds in the funnel as solvent evaporates into the headspace and contributes additional vapor to the initial \(\sim\)1 atmosphere of air pressure in the funnel. Pressure may build up inside the separatory funnel when solutions are mixed, so immediately after swirling, and with the funnel still inverted, " vent" the funnel by briefly opening the stopcock to allow for a release of pressure (Figure 4.26c).If liquid drips onto your fingers or gloves when you invert the funnel, the stopper is probably the wrong size. Gently invert the funnel (Figure 4.26b), and swirl the mixture a little.Īlthough it is not uncommon for some liquid to creep into the ground glass joint when inverted, it should be minimal.Place the stopper on the funnel, and hold the funnel such that the fingers of one hand securely cover the stopper, while the other hand grips the bottom of the funnel (Figure 4.26a).Mix the Solutions (for single extraction)
\) is used each time.įigure 4.26: a) Holding the separatory funnel before shaking, b) Inverting the funnel to mix the components, c) Venting to release pressure.
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