Oil and water are both immiscible with each other. To separate these two the apparatus needed is a separating funnel.A separating funnel is fitted stopper. Eg:A mixture of immiscible liquids is placed in a separating funnel and allowed to stand.The liquids form different layers . The heavier liquid which forms the lower layer gets collected in a vessel by opening the stopper.The stopper is then closed. The lighter liquid can be collected later in another vessel by the same method.