why lyophilic sols are called reversible sols?
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Lyophilic sols are formed directly by mixing of dispersed phase and dispersion medium. They are quite stable and thus cannot be coagulated easily. Lyophilic sols are also called as reversible colloids in nature i.e. they can be reformed if they are precipitated by simple mixing.
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Spontaneous processes are irreversible because they can be reversed only by taking a different path to get back to their original state. A reversible process can take the same path to return to its original state.
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Since ligroin is a nonpolar solvent (composed of 6-carbon alkanes), nonpolar sample molecules will easily dissolve in the solvent and not adsorb to the polar silica gel. Likewise, polar sample molecules will strongly adsorb to the stationary silica gel.
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A reversible reaction is a reaction where the reactants and products react together to give the reactants back. A and B can react to form C and D or, in the reverse reaction, C and D can react to form A and B. This is distinct from reversible process in thermodynamics.
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The stability of lyophilic sols is a result of two factors, the presence of a charge and the solvation of colloidal particles. On the other hand, the stability of lyophobic sols is only because of the presence of a charge. Thus, the lyophilic sol is more stable than lyophobic sol due to the extensive solvation.
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And then there are some things that do not act like the salt or the rock. These are called colloids. If you have made Oobleck out of cornstarch and water, then you have seen that when a colloid (the cornstarch) is mixed with water it acts like a solid and a liquid at the same time!
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Sol, in physical chemistry, a colloid (aggregate of very fine particles dispersed in a continuous medium) in which the particles are solid and the dispersion medium is fluid. If the dispersion medium is water, the colloid may be called a hydrosol; and if air, an aerosol.
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Gold number. Coagulation of gold sol is indicated by colour change from red to blue/purple when particle size just increases. More is the gold number, less is the protective power of the lyophilic colloid since it means that the amount required is more. It was first used by Richard Adolf Zsigmondy.
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Addition of even small quantities of electrolytes can cause particles to precipitate. Unlike Lyophilic colloids, the precipitations of lyophobic colloids do not regain their original state as coagulated mass cannot be dispersed into colloidal form. This shows that lyophobic sols are also irreversible in nature.
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Lyophilic : Reversible, because on evaporating the liquid, the residue left will passes into colloidal state on addition of liquid. Lyophobic : Irreversible, because on evaporating the liquid, the residue left cannot be converted into solution on mere addition of liquid.
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This term arises because hydrophobic molecules do not dissolve in water. If a molecule has areas where there is a partial positive or negative charge, it is called polar, or hydrophilic (Greek for "water-loving"). ... Some examples of polar covalent bonds often found in biological molecules include C-O, C-N and O-H bonds.
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Irreversible chemical reactions can occur in only one direction. The reactants can change to the products, but the products cannot change back to the reactants. Reversible chemical reactions can occur in both directions. The reactants can change to the products, and the products can also change back to the reactants.
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Colloidal silica as the name suggests, is polymerised silica in an insoluble colloidal form without a charge and hence not exchangable over ion exchangers. Reactive silica exists as sodium silicate and hence exchangable over type 1 anion exchanger which has highest affinity for silica.
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However, in other reactions, the reverse reaction can happen: the products can react to form the original reactants again. These are called reversible reactions. An example of a reversible reaction involves ammonia gas (NH3), hydrogen chloride gas (HCl), and ammonium chloride solid (NH4Cl).
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All reactions are reversible, but many reactions, for all practical purposes, proceed in one direction until the reactants are exhausted and will reverse only under certain conditions. ... In a reversible reaction, the reactants can combine to form products and the products can react to form the reactants.
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adiabatic process occurs without heat transfer with its surrounding.In isentropic process entropy remains constant,it is known as reversible adiabatic process. adiabatic process occurs without heat transfer with its surrounding.In isentropic process entropy remains constant,it is known as reversible adiabatic process.
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Isothermal expansion can surely be irreversible if you make it so. In fact, any process is usually at least a bit irreversible, and truly 100% reversible processes are impossible.