Exploring Mixtures and their Separation - How Can We Separate the Components of

A mixture contains more than one substance (element or compound) mixed in any proportion. Mixtures can be categorized as homogeneous (uniform composition) or heterogeneous (non-uniform composition).

A solution is a homogeneous mixture of two or more substances. The component present in larger quantity is the solvent, and the component in smaller quantity is the solute.

Concentration of a solution is the amount of solute present in a given amount (mass or volume) of solution, or the amount of solute dissolved in a given mass or volume of solvent.

A saturated solution is one in which no more solute can be dissolved at a particular temperature. The amount of solute present in the saturated solution at this temperature is called its solubility.

A suspension is a heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium. Particles are visible to the naked eye.

A colloidal solution (colloid) is a heterogeneous mixture where particle size is too small to be seen individually but large enough to scatter light (Tyndall effect). Examples include milk, fog, and clouds.

Separation techniques depend on the physical properties of components: Evaporation (separating volatile solvent from non-volatile solute), Centrifugation (separating denser particles from lighter particles), and Sublimation (separating a sublimable component like $NH_4Cl$ from a non-sublimable one).

Chromatography is used for separation of those solutes that dissolve in the same solvent, such as pigments from natural colors or drugs from blood.

Distillation is used for the separation of components of a mixture containing two miscible liquids that boil without decomposition and have a sufficient difference in their boiling points ($> 25\text{ K}$).

Fractional Distillation is used if the difference in boiling points of miscible liquids is less than $25\text{ K}$. It is used for separating different gases from air or different fractions from petroleum products.

Crystallization is a process that separates a pure solid in the form of its crystals from a solution. It is better than simple evaporation as it prevents decomposition of solids.