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.

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. Heterogeneous systems with dispersed particle sizes ranging from 1 nm to nm i.

Coagulation class 12

Coagulation techniques:. Byju's Answer. What is coagulation? Open in App. Coagulation: Coagulation is the aggregation or accumulation of colloidal particles to form a precipitate. Coagulation is caused by the removal of colloidal particle charge. On their surfaces, colloidal particles have the same charge. A colloidal solution is stable due to charge. The electrostatic force of repulsion between similarly charged particles keeps them from colliding and forming larger particles. The repulsion between them ends when the charge is removed. As the particles become closer, their size increases, resulting in precipitation. Coagulation techniques: Electrophoresis: In this method, the colloidal particles move towards the oppositely charged electrodes and get discharged and precipitated. Persistent dialysis: In this method, the parts of electrolytes are removed completely and the colloidal solution finally coagulates.

This type of solution is known as a lyophobic solution.

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. Because colloidal particles have surface electrical charges that repel each other, particles settle very slowly or not at all in a colloidal suspension.

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. It depends upon the valency of the active ion or called flocculating ion, which is the ion carrying charge opposite to the charge on the colloidal particles. According to Hardy Schulze rule, greater the valency of the the active ion or flocculating ion, greater will be its coagulating power. Thus, according to Hardy Schulze rule :.

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.

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What is Sol? Verify OTP Code required. As a result, the sedimentation step is usually preceded by coagulation, a chemical process. With the help of a coagulant, these particles form clumps. What is coagulation of sol? Consequently, particles come close together and grow in size as well as weight. There is no other preparation required. Answer: To make yoghurt, we add a small amount of acid to the milk, which changes the pH of the milk, and makes it acidic, forming negative charges in the milk colloid. 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 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. Login To View Results. Table of Contents. An injury causes platelets or thrombocytes to release a variety of factors that start the blood clotting cascade.

Coagulation techniques:. Byju's Answer. What is coagulation?

Coagulation is a chemical process that causes the destabilisation of non-settleable particles. Answer: To make yoghurt, we add a small amount of acid to the milk, which changes the pH of the milk, and mak So the electrolyte is added to the sol to neutralize the charge and settle down particles that cause coagulation or precipitation. Share Share Share Call Us. This type of solution is known as a lyophobic solution. They will then insert a needle into a vein. The coagulant is quickly added to the water and mixed during this process, allowing it to disperse throughout the entire sample of water. Suspended particles cannot be completely removed by settling alone. View Result. The repulsion between them ends when the charge is removed. Coagulation in water treatment involves the addition of substances that promote the clumping of small flocs into bigger flocs to be separated from the water more efficiently. Friedel Crafts Acylation. The neutral particles then begin to clump together to form larger particles that settle down. Get all the important information related to the NDA Exam including the process of application, syllabus, eligibility criteria, exam centers etc. Oxidizing Agent.