The study of chemistry is incomplete without the study of solutions. Solutions are mixtures of two or more components. Depending on sizes of the components, the mixtures are classified into three types:
- A coarse mixture: It is formed when the sizes of constituent components are relatively bigger, e.g. mixture of salt and sugar.
- A colloidal dispersion: It is formed when the sizes of the particle dispersed in solvent are in the range of to Colloidal particles carry positive or negative charge which stabilizes colloidal dispersion e.g. ferric hydroxide sol, arsenic sulphide sol, etc. Colloidal solutions are heterogeneous and can be easily separated.
- A true solution: A true solution is formed when soluble substances are dissolved in the solvent. The sizes of the particles dissolved are very small of the order of True solutions are homogeneous and cannot be separated into components by simple mechanic methods.
A true solution is defined as a homogeneous mixture of two or more substances, the composition of which is not fixed and may be varied within certain limits. The dissolved substance may be present in the form of molecules like sugar or urea or ions obtained on dissociation of ionic compounds like NaCl, AgNO3, H2SO4, NaOh, etc.
A solution is formed by two components, solvent and one or more solutes. The component of the solution which constitutes larger part of the solution is called solvent and the other component that constitutes smaller part is called solute. Solution is homogeneous if its composition is uniform throughout the body of the solution which constitutes smaller part is called constitute.
Heterogeneous solutions are called mixtures when two or more phases are present in it. The homogeneous solution is formed due to the force of attraction between the molecules/particles of solute and solvent. The process of solvent, the process of solvation is called hydration or aquation.
- Maharastra gov Official Book