Question

Surface tension of a solution of a surface active substance with concentration 0.056 mole/l at 293k is equal to 4.33.10^-2N/M. Calculate adsorption of this substance from a solution with concentration 0.028 mole/ l at 293 k.surface tension of pure water is 7.28.10^-2NM

Answer 1

Answer:

Some typical surfactants

Depending on their charge characteristics

the surface-active molecules may be

anionic, cationic, zwitterionic (ampholytic)

or non-ionic. Examples of surfactants that

are used in pharmaceutical formulation are

as follows:

Anionic surfactants: Sodium Lauryl

Sulphate BP

is a mixture of sodium alkyl sulfates, the chief of which is

sodium dodecyl sulfate, C12 H25 SO4

– Na+

is very soluble in water at room temperature, and is used

pharmaceutically as a preoperative skin cleaner, having

bacteriostatic action against gram-positive bacteria, and also in

medicated shampoos

is a component of emulsifying wax.

Explanation: