Colloidal Solution

What is a Colloidal Solution?

A colloidal solution, occasionally identified as a colloidal suspension, is a mixture in which the substances are regularly suspended in a fluid. A colloid is a minutely small material that is regularly spread out all through another substance.

Though colloidal systems can occur in any of the three key states of matter gas, liquid or solid, a colloidal solution unambiguously refers to a liquid concoction. The distinguishing feature between a true concoction and a colloidal concoction is fundamentally the dimensions of the constituent parts. In a true solution, for example, salt water, NaCl molecules are completely mixed into water, and the concoction can pass through a semipermeable film without getting divided. In a colloidal solution, on the other hand, the units are bigger and don’t liquefy, but come to be equally dispersed all through a liquid. As such these units will not pass through a membrane as the liquid does.

Types of Colloidal Solution:

Colloidal Solutions can be mainly classified into:

  • Foam:

    Foam in this setting is created by ensnaring a gas in a liquid. The substance being dispersed would be the gas, triggering the fluid to become frothy and foamy. A sample of this would be shaving cream.

  • Emulsion:

    An emulsion is a combination of liquids; it’s basically when one liquid is consistently dispersed all through another liquid. A sample of this would be mayonnaise or milk.

  • Sol:

    The third form is called a sol, which is when a solid is evenly dispersed throughout a fluid. Samples of sol include paint, blood and silver aquasol.

Hydrocolloid:

A hydrocolloid is a more detailed form of a colloid solution in which the fluid of a precise material is being disseminated in water. The colloidal solutions can be additionally labeled as being reversible, in which the two materials can be effortlessly divided again, or irreversible, in which they cannot do that. Hydrocolloids are usually used in food products to influence texture, as in sauces or gelatins.

In our ordinary surroundings, colloidal solutions are significant in many procedures, and can often assist as transporters. Numerous particles being conveyed through water can basically attach themselves to the units suspended in the water. By the same process, colloidal solutions can assist in the conveyance of more harmful substances through the water table, for example, radioactive material.

Colloidal solutions are very important in the medicinal field as they can be used to influence blood conditions. More precisely, they are frequently used to control colloidal osmotic pressure, the pressure exerted by proteins in the bloodstream to entice water in the vascular system.

Properties of True Solution:

  1. The size of the particle is less than 1 nm
  2. It is homogeneous in nature
  3. They diffuse rapidly through filter paper
  4. These particles also diffuse rapidly through parchment paper
  5. Particles are not visible to naked eyes
  6. Does not show Tyndall effect
  7. Transparent appearance

Properties of Suspension:

  1. The size of the particle is greater than 1000 nm
  2. It is homogeneous in nature
  3. They do not diffuse through filter paper
  4. These particles also do not pass through parchment paper
  5. Particles are big enough and can be seen with naked eyes
  6. May or may not show Tyndall effect
  7. Opaque appearance

Colloidal Solution:

  1. The size of the particle is between 1 – 1000 nm
  2. It is heterogeneous in nature
  3. They diffuse through filter paper
  4. These particles do not pass through parchment paper
  5. Particles are not visible to naked eyes but can be studied under an ultramicroscope
  6. Shows Tyndall effect
  7. Translucent appearance

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Practise This Question

Ashar has water at different temperatures.

(1)    25C                       (2) 50C                (3) 75C                         (4) 90C

He is wondering where vapour pressure of water will be highest.

Can you help him and choose the correct order of vapour pressure for him.