chemistry

TYPES OF SOLUTIONS

1. True solutions: True solutions are homogeneous system and have the size of dispersed particles less than 1 nm, i.e. 10-9. The particles of solute present in a true solution are either single molecules or irons and are homogeneously distributed throughout the solutions. These particles are invisible and cannot be seen even with a microscope. Due to very small size of dispersed particles, true solutions pass through ordinary filter paper as well as through animal membranes. Sodium chloride, sugar, urea etc. form true solutions in water. 

2. Colloidal solutions: Colloidal solutions are heterogeneous systems and have the size of dispersed particles lying between 1 nm-1000 nm (i.e. 10-9-10-6m). The particles in a colloidal solution are thus larger particles and are referred to as colloidal particles. Although colloidal particles are larger in size, yet they are not large enough to be seen with naked eye. However, they can be seen with the help of an ultra microscope. Colloidal solutions can pass through ordinary filter paper but not through an animal membrane, Gum Arabic, gelatin, glue etc. form colloidal solutions when dispersed in water.

3. Suspensions: Suspensions are also heterogeneous system and have still larger particles. The size of particles present in a suspension is more than 1000 nm (i.e., >10-6m). These particles are either visible to naked eye or can be seen under a microscope. The suspensions neither pass through an animal membrane nor through an ordinary filter paper. Stirred muddy water is an example of suspensions.