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单词 Ostwald's dilution law
释义 Ostwald's dilution law
An expression for the degree of dissociation of a weak electrolyte. For example, if a weak acid dissociates in water
HA ? H+ + A-
dissociation constant Ka is given by
Ka = α2n/(1 - α)V
where α is the degree of dissociation, n the initial amount of substance (before dissociation), and V the volume. If α is small compared with 1, then
α2 = KV/n
; i.e. the degree of dissociation is proportional to the square root of the dilution. The law was first put forward by F. W. Ostwald to account for electrical conductivities of electrolyte solutions
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