Ostwald's theory of indicators


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Noun1.Ostwald's theory of indicators - (chemistry) the theory that all indicators are either weak acids or weak bases in which the color of the ionized form is different from the color before dissociation
scientific theory - a theory that explains scientific observations; "scientific theories must be falsifiable"
chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions