isoionic point

noun
iso·ion·ic point | \ˌī-sō-ī-ˈän-ik- \

Medical Definition of isoionic point 

: the hydrogen-ion concentration expressed usually as the pH value at which the ionization of an amphoteric substance as an acid equals the ionization as a base and becomes identical with the isoelectric point in the absence of foreign inorganic ions

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