Ostwald Dilution Law

Ostwald dilution law

[′ȯst‚vält di′lü·shən ‚lȯ]
(physical chemistry)
The law that for a sufficiently dilute solution of univalent electrolyte, the dissociation constant approximates a 2 c /(1 - a), where c is the concentration of electrolyte and a is the degree of dissociation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Ostwald Dilution Law


the relationship that expresses the dependence of electrical conductivity on concentration in a dilute solution of a binary weak electrolyte:

where K is the dissociation constant of the electrolyte, c is the concentration, and λ and λ are the values of the electrical conductivities at c and at infinite dilution, respectively. The Ostwald dilution law proceeds from the law of mass action and the equation λ/λ = α, where α is the degree of dissociation.

The Ostwald dilution law was derived by W. Ostwald in 1888. Ostwald’s experimental confirmation of the law was very important to the the founding of the classical theory of electrolytic dissociation.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.