Question

What is the difference between absorption and assimilation ?
Aniline, a starting material for urethane plastic foams, consists of C, H, and N. Combustion of such compounds yields CO2, H2O, and N2 as products. If the combustion of 9.71 g of aniline yields 6.63 g H2O and 1.46 g N2, what is its empirical formula?

Answer 1

Answer:

Difference Between Adsorption and Absorption

Criteria

Absorption

Adsorption

Definition Assimilation of the molecular system throughout the bulk of the solid or liquid medium. Accumulation of molecular species at the bottom instead of the liquid or solid.

Phenomenon A bulk phenomenon. A surface phenomenon.

Heat exchange Endothermic process Exothermic process

Temperature The temperature has no effect. Influenced by low temperature

Rate of reaction Occurs at a uniform rate. Increases steadily and reaches equilibrium.

Concentration It is constant throughout the medium. The Concentration at the bottom of adsorbent is different from that in bulk.

What is Adsorption?

Adsorption is the adhesion of molecules (or ions and atoms) to the surface of a solid or liquid. The molecules get accumulated only at the surface and do not enter the bulk of the adsorbing material.

The substance whose molecules get adsorbed at the surface is called the adsorbate.

The substance on whose surface the process takes place is called the adsorbent.

It is a surface phenomenon.

Examples of Adsorbents

Some examples of good adsorbents include:

Alumina gel

Silica gel

Zeolites

Activated carbon

Graphite

What is Desorption?

Desorption is the reverse process in which the adsorbed substance is removed from the surface of the adsorbent.

EXPLANATION

What is Absorption?

Absorption is a physical or chemical effect or a mechanism in which electrons, molecules or ions join some bulk phase – solid or liquid substance. It is a separate mechanism from adsorption because molecules undergoing absorption are soaked up by the length, not by the air. Adsorption is based on the surface where a film of adsorbate is developed on the surface, and absorption includes the complete volume of the absorbing agent.

Mechanism of Adsorption

The process of adsorption arises due to the fact that the forces acting on the surface particles of a substance are not the same as that acting on the bulk of the material. Unlike the particles inside the bulk, on the exposed surface, the particles are not surrounded by atoms on all sides.

Consequently, the forces on the inside balance each other, whereas those on the surface are unbalanced. The unbalanced residual forces on the surface have the tendency to attract the adsorbate particles. This leads to the process of adsorption.