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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.
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Yes, oil and water are immiscible, so they form separate layers. The oil floats on top because it is lighter — 910 g of oil fills 1 litre, so its density (0.91 g/mL) is less than water's (1 g/mL).
They are separated using a separating funnel: let the layers settle, open the stopcock to drain the lower water layer, then collect the oil separately.
Cooking Oil and Water
1 litre of oil weighs 910 g
density = 0.91 g/mL — less than water's 1.00 g/mL
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They are immiscible
two layers form; the lighter oil floats on top
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Separating funnel
settle → open the stopcock → drain the water → collect the oil
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Yes — oil on top, split with a separating funnel
