Medical Definition of reversible colloid
: a colloid that can be precipitated as a gel and then again dispersed as a sol.
What is reversible colloids give an example?
i) Lyophilic Colloids: These are the colloidal solutions in which dispersed particles have strong affinity for dispersion medium. These sols are stable and reversible. Some examples are starch, gum, gelatin sol etc.
Which of the Lyophobic and Lyophilic sol is reversible in nature?
Lyophilic sols are reversible in nature. They can be prepared again by simply mixing the dispersion medium with the dispersion phase and shaking the mixture. Lyophobic sols are those in which the dispersed phase has no attraction for the dispersion medium or the solvent.
Which is reversible sol Why?
A sol in which a dispersion medium can be easily removed from the dispersed phase and can be again added or mixed with it to from the sol, is known as reversible sol. For example, the colloidal sol of starch in water.
Which colloidal solution is reversible?
Lyophilic colloids are called as reversible sols.
What is the difference between Lyophilic colloids and lyophobic colloids?
Hint: Lyophobic colloids are colloids that hate liquids while lyophilic colloids are those colloids that love liquids.
Why lyophobic colloids are irreversible?
Lyophobic colloids are unstable in nature. They coagulate easily in addition to a small amount of any suitable electrolyte. In lyophobic colloids, the colloidal particles cannot be separated from the dispersion medium Thus, lyophobic colloids are irreversible.
Why Lyophilic sols are easily coagulated?
Lyophobic sols are less stable since their stability is due to charge only. On the other hand, lyophilic sols are more stable since their stability is due to both charge as well as solvation of the particles. Thus, lyophobic sols are easily coagulated.
Why are Lyophobic colloids stable?
The stability of a lyophobic colloidal solution is due to the fact that the colloidal particles in the sol are electrically charged. … All the dispersed particles in a colloidal solution carry the same charge while the dispersion medium has an equal and opposite charge.
Why Lyophilic colloidal sols are more stable than Lyophobic colloidal sols?
The lyophilic sols are more stable than lyophobic sols because lyophilic sols are solvent loving whereas lyophobic sols are solvent hating. … Lyophobic sols are more stable because the colloidal particles are more solvated. Therefore, option C is the correct option.
Is starch Lyophilic?
Starch, gum, gelatin, egg albumin etc. are examples of lyophilic sols. Starch forms lyophilic sol when water is used as the dispersion medium.
Are Lyophilic sols irreversible sols?
Lyophilic sols are reversible sols.
Is starch a reversible colloid?
Examples of reversible sols are: gum, gelatin, starch, rubber.
Why electrolyte is added to Lyophobic sols?
In lyophobic systems, by adding electrolytes the coagulation rate increases sharply. Lyophobic colloids. These are unstable and hence, require traces of stabilizers. When an electrolyte is added to the colloidal solution, the particles of the sol take up the ion which is oppositely charged and thus get neutralised.
Which is an irreversible colloid?
Examples of irreversible systems include sols (dilute suspensions), pastes (concentrated suspensions), emulsions, foams, and certain varieties of gels. The size of the particles of these colloids is greatly dependent on the method of preparation employed.
Are Lyophobic colloids?
-Lyophobic colloids: Lyophobic colloids are the colloidal solution in which the dispersed phase has very little affinity for the dispersion medium. The solution of this colloid is known as lyophobic sol and cannot be directly prepared. They are prepared by special methods. The lyophobic sols are irreversible in nature.
What is the difference between Lyophilic and Lyophobic sols?
Lyophilic sols are reversible in nature, which means that they can be disintegrated in their dispersed phase and medium. Lyophobic sols are irreversible in nature, which means that they cannot be disintegrated in their dispersed phase and medium.
What do you mean by Lyophilic and lyophobic colloidal solutions?
In lyophilic sols, the dispersed phase particles have great affinity (or love) for the dispersion medium. These sols are reversible. Examples include gum, gelatin, starch, proteins and rubber etc. In lyophobic sols, the dispersed phase particles have no affinity (or love) for the dispersion medium.
What are protective colloids how a Lyophilic colloid can stabilize a lyophobic colloid explain?
A protective colloid is a lyophilic colloid that when present in small quantities keeps lyophobic colloids from precipitating under the coagulating action of electrolytes.
Why colloidal solutions show low osmotic pressure?
Why is osmotic pressure of a colloidal solution less than that of true solution ? Because colloidal solutions being bigger aggregate of a large number of molecule, the effective number of particles in colloidal solution is relative much smaller.
Are Lyophilic sols are self stabilizing?
The colloidal solutions in which the particles of the dispersed phase have a great affinity for the dispersion medium are called lyophilic colloids. They are self-stabilizing.
Why is alum added to water containing suspended impurities?
All the colloidal particles have similar charges, so they repel each other and are unable to combine to form larger particles. … Hence, alum is added to water containing suspended impurities to coagulate the suspended particles.