Illustrated Glossary of Organic Chemistry

Miscible: Two liquids that combine in any ratio to form a homogeneous solution.  Liquids which have little or no mutual solubility are immiscible.



Mix 20 mL water (dyed red)
80 ml ethanol (colorless)

Mix 50 mL water (dyed red)
50 ml ethanol (colorless)

Mix 80 mL water (dyed red)
20 ml ethanol (colorless)

Homogeneous solution
Ethanol (colorless) and water (dyed red) are miscible, because their mixture in any proportion always yields a homogeneous solution.

Mix 50 mL water (dyed red)
50 mL canola oil (light yellow)

Two layers
Not homogeneous

<--- Oil layer

<--- Vinegar layer
Canola oil (cooking oil; light yellow) and water (dyed red) are
immiscible. They do not dissolve in each other, and do not form
a homogeneous solution with any canola oil : water ratio.

In Italian dressing, water and acetic acid are miscible.
They form the vinegar layer. The vinegar layer (on the
bottom) and the oil layer (on the top) are immiscible.