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CHEMISTRY FORM 1


i Common Chemistry Laboratory Chemicals
ii Common Chemistry Laboratory Apparatus
iii Safety in the Chemistry Laboratory
iv Why we should learn Chemistry
1. INTRODUCTION TO CHEMISTRY
2. SIMPLE CLASSIFICATION OF SUBSTANCES AND SEPERATION OF MIXTURES
3. ACIDS, BASES AND INDICATORS
4. AIR AND COMBUSTION
5. WATER AND HYDROGEN
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Simple Classification of Substances and Separation of Mixtures: Separation of immiscible liquid-liquid mixture

2.0 Simple Classification of Substances and Separation of Mixtures


2.7 Separation of immiscible liquid-liquid mixture


How can we separate water and kerosene?


Materials and substances required
  1. Separating column or separating funnel
  2. Retort stand
  3. Beakers, dropper, and the mixture

Study the following set-up (labelled diagram) carefully.


Set up seperation of kerosene and water, high school chemistry

Open the video below, separating funnel or separating column, to observe how immiscible liquids can be separated.


Questions 2.7


  1. State two properties this method of separation relies on.
  2. Explain why the mouth of separating funnel is plugged with cotton wool.
  3. What would be the problem of decanting off the top oil layer?
  4. The boundary mixture consists of small amounts of both components. How can they be separated?
  5. Write the procedure for this method of separation.
  6. Name at least three other examples of immiscible liquid-liquid mixtures.

NB: Immiscible liquids are best separated using separating funnel.


Answers to Questions 2.7