Question

difference between colloidal solution suspension solution and true solution

Answer 1

True Solution, Suspension and Colloidal Solution

Based on distinct properties, solutions can be classified into True Solution, Suspension and Colloid. This classification is necessary to understand concepts of colloidal solutions and distinguish it from rest of the types.

True Solution

True Solution is a homogeneous mixture of two or more substances in which substance dissolved (solute) in solvent has the particle size of less than 10-9 m or 1 nm. Simple solution of sugar in water is an example of true solution. Particles of true solution cannot be filtered through filter paper and are not visible to naked eye.

Suspensions

Suspension is a heterogeneous mixture in which particle size of one or more components is greater than 1000nm.When mud is dissolved in water and stirred vigorously, particles of mud are distributed evenly in water. After some time, the particles of this solution settle under water due to influence of gravity. This solution is an example of Suspension (see picture below). Contrary to True Solution,particles of suspension are big enough to be seen with naked eye.



Suspension Settled Muddy Water

Colloidal Solution

Colloidal Solution is a heterogeneous mixture in which particle size of substance is intermediate of true solution and suspension i.e. between 1-1000 nm. Smoke from a fire is example of colloidal system in which tiny particles of solid float in air. Just like true solutions, Colloidal particles are small enough and cannot be seen through naked eye.They easily pass through filter paper. But colloidal particles are big enough to be blocked by parchment paper or animal membrane.



Black Cloud of Smoke with Fire in Forest

Difference between True Solution, Suspension and Colloidal Solution

The table given below summarizes the major properties and points of distinction between each type of solution with respect to different properties.

PropertyTrue SolutionColloidal SolutionsSuspensionSize of the particles< 1nm1– 1000nm>1000nmNatureHomogeneousHeterogeneousHeterogeneousFilterability(Diffusion through parchment paper)Particles of true Solution diffuse rapidly through filter paper as well as parchment paper.Colloidal particles pass through filter paper but not through parchment paper.Suspension particles do not pass through filter paper and parchment paper.VisibilityParticles of True Solution are not visible to naked eye.Colloidal particles are not seen to naked eye but can be studied through ultra microscope.Suspension particles are big enough to be seen by naked eye.Tyndall effectTrue Solution does not show Tyndall effect.Colloids shows Tyndall effect.Suspension may or may not show Tyndall effect.AppearanceTransparentTranslucentOpaque

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Answer 2

true solution is homogenous in nature, not visible by naked eye,stable,no tyndall is shown,it can't be separated by the process of fiteration
suspensions are heterogeneous in nature,suspended particles are visible by naked eye,unstable, tyndall effect is shown ,can be separated by fiteration .
colloid is heterogeneous in nature,suspended particles can be seen under ultra microscope,unstable,tyndall effect is shown ,can't be separated by fiteration.