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Dissociation in chemistry and biochemistry is a general process in which molecules (or ionic compounds such as salts, or complexes) separate or split into smaller particles such as atoms, ions or radicals, usually in a reversible manner. For instance, when an acid dissolves in water, a covalent bond between an electronegative atom and a hydrogen atom is broken by heterolytic fission, which gives a proton (H+) and a negative ion. Dissociation is the opposite of recombination. == Dissociation constant == (詳細はchemical equilibrium : AB A + B the dissociation constant ''K''a is the ratio of dissociated to undissociated compound : where the brackets denote the equilibrium concentrations of the species. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dissociation (chemistry)」の詳細全文を読む スポンサード リンク
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