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DISSOCIATION, a separation or dispersal, the opposite of association. In chemistry the term is given to chemical reactions in which a substance decomposes into two or more substances, and particularly to cases in which associated molecules break down into simpler molecules. Thus the reactions NH4Cl ⇔ NH3 + HCl, and PCl5 ⇔ PCl3 + Cl2 are instances of the first type; N2O4 ⇔ 2NO2, of the second (see Chemical Action). Electrolytic or ionic dissociation is the separation of a substance in solution into ions (see Electrolysis; Solution).

Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)

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