What is the difference between insolubility and immiscibility?

Answer 1

Insoluble = solid not soluble in liquid solvent, example sand in water

Immiscible = liquid not soluble/miscible in liquid solvent, example water in oil or oil in water.

Answer 2

They both mean nearly the same thing.

When one substance completely dissolves in another substance, it is said to be soluble in it.

It is best illustrated by a solid dissolving in a liquid. Like salt or sugar dissolving in water. Here, salt/sugar is the solute and water is the solvent.

When two substances completely mix with each other to form a homogeneous solution, they are called miscible. Miscibility is complete solubility.

It is generally seen in liquids. For example, water and (ethyl) alcohol are miscible while oil and water are not.

When something is soluble in something else, the solute dissociates into ions. It undergoes a physical change. No such change occurs during muscibility. Solubility can be measured. Sugar is soluble in water to a certain amount. After the solution is saturated, it will just start piling up at the bottom of the vessel. Miscibility is absolute. Either two substances are miscible or they aren't. You can keep adding as much alcohol as you want to water, it will still mix completely.

Answer 3

Insolubility refers to the inability of a substance to dissolve in a particular solvent, while immiscibility refers to the inability of two substances to mix or form a homogeneous solution. In insolubility, the substance remains in a separate state within the solvent, while in immiscibility, two substances form distinct layers due to their inability to mix.