Salting out

The salting out is a technique which consists in separating a substance in solution from sound Solvant by introducing another more soluble substance which takes its place.

Description

When a substance is in solution, each Molécule (or Ion) is surrounded by molecules of solvent which prevent it from grouping with its congeneric and thus to regain its shape “with the free air”.

If one introduces into a solution a substance more easily soluble than the first, this one monopolizes the molecules of solvent making it possible the first to separate from solvent.

Uses

It is in the beginning a technique of soap factory which consists in adding salt in soapy water to make precipitate the Savon (very little even at all soluble in salt water).

This technique is also used to separate DNA or the Protéine S (by adding Sulfate of Ammonium).

Experiment of the bottle of Coca-Cola

This experiment, which made run much ink on Internet, consists in very quickly introducing sugar (or Mentos) into an open bottle of Coca-Cola: a jet of Foam which can reach one meter in height appears then.

According to Research , it acts of a phenomenon of salting out between the CO {{sub|2}} and the Sugar, this last taking the place of the first

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