Table of Contents
What is meant by coagulation of a colloidal solution describe any 3 methods of coagulation?
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. (ii) Mixing of two oppositely charged sols: When equal proportions of oppositely charged sols are mixed, they neutralise each other resulting in coagulation.
What is meant by coagulation of a colloidal solution name any method by which coagulation of lyophobic sol can be carried out?
Three methods by which lyophobic sols can be coagulated are: Electrophoresis: The colloidal particles travel towards opposite charged electrodes during electrophoresis, get discharged and coagulated.
What is coagulation mention a method to bring about the coagulation of a colloid?
The colloidal particles are compelled to move towards the oppositely charged particles in this method, and later they are discharged and collected at the bottom. In this type of coagulation technique, an equal amount of oppositely charged particles are mixed, and they precipitate by canceling out their charges.
What is coagulation solution?
In coagulation, colloidal particles are destabilized by neutralizing those opposite forces which keep them separate. Thus, the particles combine to form larger particles and this is achieved by rapid mixing of solution which spreads the coagulant agent completely.
What is the coagulation process?
Coagulation, in physiology, the process by which a blood clot is formed. The formation of a clot is often referred to as secondary hemostasis, because it forms the second stage in the process of arresting the loss of blood from a ruptured vessel.
What is coagulation of colloids explain with example?
Coagulation is the destabilization of Colloids by neutralizing the electric charge of the dispersed phase particles, which results in aggregation of the colloidal particles.
What happens when two oppositely charged sols are mixed?
(2) By mixing two oppositely charged sols : When oppositely charged sols are mixed in almost equal proportions, their charges are neutralised. As a result, their charge gets neutralised and this causes the uncharged, particles to come closer and to get coagulated or precipitated.
Is soap a sol?
A sol is a combination of a solid that is evenly dispersed throughout a fluid. Since, in Soap dispersion medium is liquid and dispersed phase is gas. And after going through the classification of colloidal solution as written above, we can simply conclude that Soap is an example of Foam.
How can we prevent the coagulation of a lyophobic colloid?
Lyophobic sols can be easily coagulated by the addition of small quantity of an electrolyte. When a lyophilic sol is added to any lyophobic sol, it becomes less sensitive towards electrolytes. Thus, lyophilic colloids can prevent the coagulation of any lyophobic sol.
What is coagulation with example?
When it is heated the runny yolk and white (albumen – which is the major source of protein) turn solid. The proteins in the egg start to thicken, a process known as coagulation. Coagulation is irreversible, the proteins cannot be turned back into their liquid form. Another example is heating milk.
What are the methods of coagulation?
There are a number of different methods employed including clot-based coagulation tests, chromogenic assays, immunological tests, and aggregation studies. Today automated machines are designed to be able to perform a number of different methodologies.
What are the common coagulants used?
Chemical Coagulants Used In Water Treatment Aluminum Sulfate (Alum) – One of the most commonly used water treatment chemicals in the world. Aluminum Chloride – A second choice to Alum as it is more expensive, hazardous and corrosive. Polyaluminum Chloride (PAC) & Aluminum Chlorohydrate (ACH).
What is called coagulation?
Coagulation: In medicine, the clotting of blood. The process by which the blood clots to form solid masses, or clots. More than 30 types of cells and substances in blood affect clotting. The process is initiated by blood platelets.
What is coagulation value?
Coagulation value is the millimoles of an electrolyte that must be added to 1 L of a colloidal solution for complete coagulation. The phenomenon of the precipitation of a colloidal solution by the addition of the excess of an electrolyte is called coagulation or flocculation.
What are the application of colloids?
A colloid is used as thickening agents in industrial products such as lubricants, lotions, toothpaste, coatings, etc. In the manufacture of paints and inks, colloids are useful. In ball-point pens, the ink used is a gel (liquid-solid colloid).
What are the 4 steps of coagulation?
1) Constriction of the blood vessel. 2) Formation of a temporary “platelet plug.” 3) Activation of the coagulation cascade. 4) Formation of “fibrin plug” or the final clot.
What is the purpose of coagulation?
Coagulation is a process used to neutralise charges and form a gelatinous mass to trap (or bridge) particles thus forming a mass large enough to settle or be trapped in the filter.
What is the normal coagulation process?
Blood coagulation is a process that changes circulating substances within the blood into an insoluble gel. The gel plugs leaks in blood vessels and stops the loss of blood. The process requires coagulation factors, calcium and phospholipids. The coagulation factors (proteins) are manufactured by the liver.
What are Multimolecular colloids give examples?
Examples of multimolecular colloid: -Gold sol and sulphur sol consist of thousands of particles held together by vander Waal’s forces. Examples of macromolecular colloids: -Macromolecules like starch, cellulose, proteins, polymer like rubber, and gelatin.
What is colloids and its classification?
A colloid is a mixture in which one substance which has fine particles (dispersed phase) mixed into another substance (dispersion medium). The particles of the colloids have a range from 1 to 1000 nm in diameter. The solution is called colloidal dispersion because the particles of solutions do not mix or settle down.
What is coagulation class 12th?
Coagulation is the precipitation of colloids by removal of the charge associated with colloidal particles. Colloidal particles carry same charge on their surfaces. Due to charge, colloidal solution is stable.
Which of the following is an example of positively charged sols?
So, option (D) ferric hydroxide gives a positively charged sol.
What is hardy Schulze rule?
> Hardy Schulze rule states that the amount of electrolyte required for the coagulation of a definite amount of a colloidal solution is dependent on the valency of the coagulating ion. Hardy and Schulze observed that greater the valency of the flocculating ion or coagulating ion, the greater is its power to coagulate.
Why are lyophobic sols unstable?
Lyophilic sols are solvent loving and hence there is an existence of strong intermolecular forces because of which the colloid particles are always solvated. In lyophobic sols such forces are absent and hence there is no solvation of the colloid particles making the sol unstable.
