How does solute concentration affect surface tension?

In case the solute is very easily soluble, then the surface tension of liquid increases. If the solute is less soluble, then the surface tension of liquid decreases. For example, by adding soap or phenol in water, its surface tension decreases.

How does the surface tension of a solution vary with temperature and concentration?

Surface tension varies with temperature. It is because as the temperature increases the molecules on the surface move apart from each other. This result in the force of attraction between molecules goes weaker and hence surface tension decreases as temperature increases.

What is the relationship between critical micelle concentration and surface tension?

Below the CMC the surface tension decreases with increasing surfactant concentration as the number of surfactants at the interface increases. Above the CMC, in contrast, the surface tension of the solution is constant because the interfacial surfactant concentration does not change any more.

How does surface tension vary with concentration of sugar solution?

\%, the surface tension of the aqueous solutions of dextrose and fructose decreases continuously with increasing concentration (the effect is more pronounced for dextrose). Then, the surface tension increases above the surface tension of water (similar to sucrose solutions) for higher concentrations.

Does surface tension vary with temperature?

The surface tension of liquids and the influence of surfactants on the surface tension depend on the temperature. In general, the surface tension decreases with increasing temperature.

What is the relation between surface energy and surface tension?

This work done in stretching the film is stored in the area dA in the form of potential energy (surface energy). Hence, surface tension = surface energy per unit area. Thus, surface tension is equal to the mechanical work done per unit surface area of the liquid, which is also called surface energy.

What is CMC and why is it important in detergent’s action?

The CMC (critical micelle concentration) is the concentration of a surfactant in a bulk phase, above which aggregates of surfactant molecules, so-called micelles, start to form. The CMC is an important characteristic for surfactants.

What is CMC in surface chemistry?

From Wikipedia, the free encyclopedia. In colloidal and surface chemistry, the critical micelle concentration (CMC) is defined as the concentration of surfactants above which micelles form and all additional surfactants added to the system will form micelles. The CMC is an important characteristic of a surfactant.

Why does sugar affect the surface tension?

In a dispersed system, sugars are repelled by the hydrophobic surface, thus living a thin zone inside the hydrophilic/hydrophobic interface that is depleted of sugar molecules, giving rise to a higher apparent surface tension (Docoslis, Giese, & van Oss, 2000) .

Is there a linear relationship between surface tension and surface concentration?

It was found that there is a linear relationship between the surface tension and the surface concentration for the pure solutions of each surfactant, but their surface tension and surface excess cannot be correlated linearly.

What is sursurface tension?

Surface tension is a physical property equal to the amount of force per unit area necessary to expand the surface of a liquid. It is the tendency of a fluid surface to occupy the smallest possible surface area. Surface tension is a principal factor in capillary action.

What determines the surface tension of surfactants?

It is striking that the same surface tension–surface concentration linearity holds for two different surfactants, although they have apparently distinct counter-ions. Based on this finding, it is derived that the surface tension is decided by surface concentration of the surface active ions.

How does the concentration of H2O affect its surface tension?

Normally, the concentration of whatever substances H2O contains has nothing to do with its surface tension. An exception is the concentration of surfactants. The most commonly known surfactant is soap, i.e. sodium stearate. The more sodium stearate molecules presents in a certain amount of H2O, the lower the surface tension.