Chemistry

Arsenious sulphide sol (double decomposition) Preparation By double decomposition, a sol of arsenic sulphide is obtained by passing hydrogen sulphide through a cold solution of…

Silver Bromide Sol (double decomposition) Preparation A very dilute solution of silver nitrate is prepared in subdued light and any suspended impurity is carefully removed…

Sol and its Preparation A sol is a dispersion of solid particles in a liquid medium. If the liquid is water it is called hydrosol,…

Disperse Phase and Dispersion Medium The material body which is present in a state of fine discrete particles is called the disperse phase and the…

Types of Colloids A colloid is one of the three primary types of mixtures, with the other two being a solution and suspension. A colloid…

Crystalloids and Colloids Graham divided all substances in solution into two classes: (i) Crystalloids, like sodium chloride, sugar etc. which diffused rapidly and easily, passed…

Freundlich Isotherm The Freundlich isotherm, presented by Freundlich in 1906 (Gaballah et al., 1997), was the first isotherm model proposed for sorption processes. It can…

Langmuir Isotherm for Solid-liquid Adsorption Classical isotherms of adsorption (Frumkin, Langmuir, Henry) were based on the model of nonpenetrable interface, where an adsorbate can substitute…

Effective Separation by Chromatography An effective separation by chromatography requires a judicious choice of the adsorbing material and the solvent, and they are to be…

Chromatography An important and useful application of adsorption is in chromatography. Chromatography may be roughly defined as a process by which several constituents in a…