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 What  is the difference between a suspension and a colloidal solution? Both are heterogeneous mixtores.

Asked by Indronil Mukher...(parent) , on 21/9/11

Answers

A suspension is cloudy and heterogeneous. The particles are larger than 10,000 Angstroms which allows them to be filtered. If a suspension is allowed to stand the particles will separate out.

A colloid is intermediate between a solution and a suspension. While a suspension will separate out a colloid will not. Colloids can be distinguished from solutions using the Tyndall effect. Light passing through a colloidal dispersion, such as smoky or foggy air, will be reflected by the larger particles and the light beam will be visible.


Posted by thecoolhermoini...(student)on 21/9/11

Property
Colloidal Solutions Suspension

       
Nature   Heterogeneous Heterogeneous

Filterability(Diffusion through parchment paper)   Colloidal particles pass through filter paper but not through parchment paper. Suspension particles do not pass through filter paper and parchment paper.

Visibility   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 effect   Colloids shows Tyndall effect. Suspension may or may not show Tyndall effect.

Appearance   Translucent Opaque

 

 

hope this helps..thumbzuppls!

Posted by Zoya Sana Siddi...(student)on 21/9/11

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 SOLUTION-The particles are smaller than suspension and colloid wherein the diameter is 1X10^-7 cm
Characteristics:
1. particle of the dissolved material is very small
2. evenly distributed
3. cannot be filtered
4. light can pass through
5. do not settle
Examples:Salt and water, sugar and water

COLLOID-Particles are not as big as suspension. Exhibits Tyndall effect (the scattering of light by the colloidal particles, light cannot pass through)
Characteristics:
1. uneven
2. two phases are observed
3. particles cannot settle
4. cannot be filtered
Example: mayonnaise

SUSPENSION-Particles are bigger which can be seen by our naked eye. The size of the particle is 1X10^4 cm
Characteristics:
1. particles can settle
2. can be filtered 
Example: Water and stone

Posted by Angel Sharma(student)on 21/9/11

EXPERT ANSWER

Hi,

 

We can differentiate between the true solution, Colloidal solution and suspensions on the basis of the size of the solute which is dissolved in the solvent.

 

In the true solution the size of solute particle is very small (less than 1 nm) as a result, the solute particle completely dissolve in the solvent forming homogenous solution.

 

 In case of suspensions the size of solute particle is large (more than1000 nm) as a result, the solute particle does not dissolve in the solvent and settles down at the bottom in the solvent.

 

 In case of colloidal the size of solute particle is large (1 nm-1000 nm) as a result; the solute particle does not completely dissolve in the solvent and remain suspended in the solvent.

 

Thus we say that in colloidal solution size of solute particle is greater than true solution and smaller than suspension.

Difference between homogeneous and heterogeneous mixtures:

Heterogeneous mixtures

Heterogeneous mixture

A mixture is said to be homogeneous if its constituents are uniformly distributed and are not physically distinct.

A mixture is said to be heterogeneous if its constituents are not uniformly distributed and are physically distinct.

For example, sugar solution, salt in water etc.

 

For example: Mixture of sand in water

Posted by Prerna Bansal(MeritNation Expert)on 22/9/11

This conversation is already closed by Expert

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 A colloidal solution is a heterogeneous mixture in which the size of the solute particles is greater than the solute particles of the solution, but lesser than the solute particles of the suspension. A colloidal solution seems to be a homogeneous mixture because of the uniform distribution of its particles throughout the suspension. However, it is in fact a heterogeneous mixture. Milk is an example of colloidal solution.

The properties of colloidal solutions are as under:
1. A colloid is a heterogeneous mixture.
2. The size of the solute particles in a colloid is bigger in a solution, but smaller in a suspension. They are between 1 nm and 100 nm in diameter.
3. The solute particles present in a colloidal solution cannot be seen even with a microscope.
4. As the size of the particles present in colloids is quite large, they scatter the beam of light passing through them.
5. The solute particles of a colloid cannot be filtered using a filter paper.
6. Colloids are quite stable. Their particles do not settle down when left undisturbed.

Posted by Shuchi Tyagi(student)on 22/9/11

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 We can differentiate between the true solution, Colloidal solution and suspensions on the basis of the size of the solute which is dissolved in the solvent.

In the true solution the size of solute particle is very very small (less than 1 nm) as a result, the solute particle completely dissolve in the solvent forming homogenous solution.

 In case of suspensions the size of solute particle is large ( 1 nm-100 nm) as a result, the solute particle does not dissolve in the solvent  and settles down at the bottom in the solvent.

 In case of colloidal the size of solute particle is large ( 1 nm-100 nm) as a result, the solute particle does not completely dissolve in the solvent  and remain suspended in the solvent.

Thus we say, that in colloidal solution size of solute particle is greater than true solution and smaller than suspension.

Posted by Shuchi Tyagi(student)on 22/9/11

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  suspensions:Suspensions consist of particles of a solid suspended in a liquid medium. Suspensions are systems with two distinct phases. The particles in suspensions are bigger than 100 nm to 200 nm across. The particles of a suspension may not be visible to the naked eye but are visible under a microscope. Suspensions are heterogeneous systems. They stay only for a limited period i.e. these are not stable as the particles have a tendency to settle down under the influence of gravity. The particles of a suspension can neither pass through ordinary filter paper nor through animal membranes. Examples of suspensions are sodium chloride in benzene, turmeric in water, silver chloride, barium sulphate or sand in water.

Posted by Shuchi Tyagi(student)on 22/9/11

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  colloids:Colloidal solution or colloidal state or colloidal dispersion, represent an intermediate kind of a mixture between true solution and suspension. The size of a colloidal particle lies roughly between 1-100 nm. Colloids are also a two-phase heterogeneous system consisting of the dispersed phase and dispersion medium. However, colloidal particles present in small amount as the dispersed phase component behave like a solute in a solution when suspended in a solvent phase or dispersing medium, because of their small size.

Since the dispersed phase in a colloidal system is uniformly distributed in the dispersion medium, the colloidal state appears homogenous to the naked eye or even an ordinary microscope (due to particles being invisible). However it is a heterogeneous dispersion of two immiscible phases and this is proved by viewing it under an ultra-microscope, where the light reflected by colloidal particles can be seen. Colloidal particles do not settle down under gravity: a colloidal solution of gold prepared by Faraday over 125 years ago continues to be in excellent condition even today. Colloids can pass through ordinary filter paper but do not pass through animal membranes.

Posted by Shuchi Tyagi(student)on 22/9/11

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Colloids

Colloids are mixtures with particle sizes that consist of clumps of molecules. The particles have dimensions between 2 to 1000 nanometers.

The colloid looks homogeneous to the naked eye. Fog and milk are examples of colloids.

Colloids frequently appear "murky" or "opaque". The particles are large enough to scatter light. You have experience with the way fog interacts with the light from car headlights. Colloids generally do not separate on standing. They are not separated by filtration.

Posted by Shuchi Tyagi(student)on 22/9/11

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Suspensions

Suspensions are homogeneous mixtures with particles that have diameters greater than 1000 nm, 0.000001 meter. The size of the particles is great enough so they are visible to the naked eye. Blood and aerosol sprays are examples of suspensions.

Suspensions are "murky" or "opaque". They do not transmit light. Suspensions separate on standing. The mixture of particles can be separated by filtration.

Posted by Shuchi Tyagi(student)on 22/9/11

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Examples of solutions

Solutions are mechanical combinations of materials. The physical state for the materials in the solutions is surprising varied.

Posted by Shuchi Tyagi(student)on 22/9/11

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Colloidal Solution

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.

Posted by Shuchi Tyagi(student)on 22/9/11

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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

Suspension Settled Muddy Water

Posted by Shuchi Tyagi(student)on 22/9/11

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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

Posted by Shuchi Tyagi(student)on 22/9/11

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