Also known as liquid-liquid extraction, this separates the organic compounds in a system from the non-organic (acids/bases). Additional compound(s) must be added, and the mixture is normally added to a separatory funnel. In this reaction, the target compound is extracted using diethyl ether. This causes the less dense, organic layer to separate cleanly to the top of the funnel, while the acidic/basic, non-organic layer settles to the bottom. The bottom waster layer is drained, and to the organic layer, brine (NaCl dissolved in water) is added in order to remove any remaining water and halogens left in the organic system. If another layer does form, it is drained off as waste.