undissociated

[ uhn-di-soh-shee-ey-tid, -see-ey- ]

adjective

, Chemistry.

1. not dissociated, especially into ions or into simpler molecules.

Word History and Origins

Origin of undissociated¹

First recorded in 1905–10; un- ¹ + dissociate ( def ) + -ed ²( def ); dissociation ( def 3 )

Example Sentences

Let x be the number of molecules which dissociate per second when the number of undissociated molecules in unit volume is unity, then in a dilute solution where the molecules do not interfere with each other, xp is the number when the concentration is p.

From Project Gutenberg

An explanation of the failure of the usual dilution law in these cases may be given if we remember that, while the electric forces between bodies like undissociated molecules, each associated with equal and opposite charges, will vary inversely as the fourth power of the distance, the forces between dissociated ions, each carrying one charge only, will be inversely proportional to the square of the distance.

From Project Gutenberg

The forces between the ions of a strongly dissociated solution will thus be considerable at a dilution which makes forces between undissociated molecules quite insensible, and at the concentrations necessary to test Ostwald’s formula an electrolyte will be far from dilute in the thermodynamic sense of the term, which implies no appreciable intermolecular or interionic forces.

From Project Gutenberg

It is evident that the undissociated part of each acid must eventually be in equilibrium with the free hydrogen ions, and, if the concentrations are not such as to secure this condition, readjustment must occur.

From Project Gutenberg

For instance, the colour of a salt solution is the colour obtained by the superposition of the colours of the ions and the colour of any undissociated salt that may be present.

From Project Gutenberg