The label on a cooking oil pack says one litre (910 g). If this oil is mixed with water. Class 9

The label on a cooking oil pack says one litre (910 g). If this oil is mixed with water. Class 9

Question 1.

The label on a cooking oil pack says one litre (910 g). If this oil is mixed with water, will it form a separate layer? If so, which substance will be on top? How will you separate the two layers? Also, draw the diagram of the apparatus used. Class 9

Answer:

Yes, cooking oil and water are immiscible liquids - they do not mix and will form two separate layers. Oil is less dense than water, so oil will form the upper layer. Water (denser) will form the lower layer.

Method of separation: Using a separating funnel.

Procedure: Pour the mixture into the separating funnel and allow it to stand until two distinct layers form. Open the stopcock slowly to drain the lower layer (water) into a beaker. Close the stopcock when water is almost fully drained. Then open the stopcock again to collect the upper oil layer in a separate container.

Apparatus: Separating funnel fixed on a laboratory stand with a stopcock at the bottom and a conical flask to collect each layer.