Coagulation class 12

Coagulation techniques:.

Coagulation is a process that involves colloidal particles coming together to form larger particles that eventually settle as residue or float on the surface. Coagulation is the transformation of blood from a liquid to gel, resulting in the formation of blood clots. It could lead to hemostasis or the cessation of blood loss from a damaged vessel and then repair. The addition of electrolytes usually causes coagulation to take place. The coagulating ion, also known as a flocculating ion, is the ion that is responsible for neutralising the charge on colloidal particles. The neutral particles then begin to clump together to form larger particles that settle down.

Coagulation class 12

Colloids are an important class of heterogeneous mixtures which are formed by mixing dispersed phase with the dispersion medium. Most substances like creams, milk, curd, and medicines are colloids. Colloids show special features like the Tyndall effect and the Brownian movement. In this article, there is a detailed discussion about the coagulation of colloids. Coagulation is a process of aggregation or accumulation of colloidal particles to settle down as a precipitate. Substances like metals, their sulfides etc cannot be simply mixed with the dispersion medium to form a colloidal solution. Some special methods are used to make their colloidal solutions. Such kinds of sols are known as lyophobic sols. These kinds of colloidal solutions always carry some charge on them. This is the main cause of the stability of colloids. If by any chance we can remove the charge present on the sol, the particles get closer to each other, and they accumulate to form aggregates and precipitate under the action of gravity. This process of accumulation and settling down of particles is further known as coagulation or precipitation. The process of coagulation can be carried out in the following ways:. By mixing two oppositely charged sols: In this type of coagulation equal amounts of oppositely colloids are mixed which mutually coagulates their charges resulting in the precipitation. By boiling: Whenever we boil a sol, the molecules of the dispersion medium start colliding with each other and with the surface, this, in turn, disturbs the adsorption layer.

Electrophoresis: The dispersed phase particles move towards oppositely charged electrodes in electrophoresis and are neutralised. Coagulation: Coagulation is the aggregation or accumulation of colloidal particles to form a precipitate.

Coagulation flocculation in water treatment involves the addition of compounds that promote the clumping of fines into larger flocs, allowing them to be more easily separated from the water. Coagulation is a chemical process that involves charge neutralisation, whereas flocculation is a physical process that does not involve charge neutralisation. Coagulation-flocculation can be used as a preparatory or intermediate step between other water or wastewater treatment processes such as filtration and sedimentation. Although iron and aluminium salts are the most commonly used coagulants, salts of other metals such as titanium and zirconium have also been found to be highly effective. The type of coagulant used, its dose and mass; the pH and initial turbidity of the water being treated; and the properties of the pollutants present all have an impact on coagulation.

The ions of the electrolytes are adsorbed on the sol. For example: In the presence of a large excess of the electrolyte, the charge on the particles of the dispersed phase is neutralised and as a result, they come closer, grow in size and ultimately form precipitates. Thus, the phenomenon of precipitation of a colloidal solution by the addition of excess of an electrolyte is called coagulation or flocculation. When an electrolyte is added to the sol. As a result, their charge gets neutralised and this causes the uncharged particles to come closer and to get coagulated or precipitated. This leads to coagulation. The coagulation capacity of different electrolytes is different.

Coagulation class 12

Colloids are an important class of heterogeneous mixtures which are formed by mixing dispersed phase with the dispersion medium. Most substances like creams, milk, curd, and medicines are colloids. Colloids show special features like the Tyndall effect and the Brownian movement. In this article, there is a detailed discussion about the coagulation of colloids. Coagulation is a process of aggregation or accumulation of colloidal particles to settle down as a precipitate.

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Addition of electrolytes: When excess amount of electrolyte is added, then the colloidal particles are precipitated. Open in App. Skip to content Search for:. How Do Coagulation Tests Work? What are some examples of lyophobic and lyophilic sols? It causes both sols to coagulate. Define adsorption isotherm and explain Freundlich adsorption isotherm The process of coagulation can be carried out in the following ways:. With the help of a coagulant, these particles form clumps. Other chemicals, such as ferric sulphate or sodium aluminate, could be used as well. Frequently Asked Questions. NDA Age Limit. Blood clotting begins with platelet activation and aggregation at exposed endothelial cells, followed by the deposition and stabilisation of cross-linked fibrin mesh. Give an example of coagulation.

Coagulation techniques:.

Writing Of Chemical Formulae We can denote the elements present in a compound in the form of symbols, along with their proportions, with the help of chemical formulae. Similarly, in some situations, cooling the sol causes coagulation, such as coagulation of milk, in which fats begin to float on the surface as the milk cools down. Coagulation flocculation in water treatment involves the addition of compounds that promote the clumping of fines into larger flocs, allowing them to be more easily separated from the water. Lyophilic Sol: In Lyophilic Sol, the dispersed phase and dispersion medium attract each other. This phenomenon of precipitation of colloidal particles by the addition of electrolyte is known as coagulation or precipitation. It causes both sols to coagulate. Zinc Melting Point. Table of Content. Login To View Results. Start Quiz.