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proton affinity definition
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The negative of the enthalpy change in the gas phase reaction (real or hypothetical) between a proton (more appropriately hydron) and the chemical species concerned, usually an electrically neutral species to give the conjugate acid of that species. Proton affinity is often, but unofficially, abbreviated as PA. LIAS, LIEBMAN, and LEVIN (1984). See also gas phase basicity.

See also:
primitive change definition
prior equilibrium definition
Primary Voltaic Cells definition
products definition
primary fiducial definition
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