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Van 't Hoff Factor

Accounts for the effect of ionic dissociation on the observed molecular ion peak intensity in mass spectrometry analysis.
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The statement of the theorem

Define the van 't Hoff factor ii for the dissociation of a solute in a solvent. If the solute dissociates into nn ions, the theoretical factor is itheory=ni_{theory} = n. The observed van 't Hoff factor iobsi_{obs} relates the measured concentration of ions [Cion][C_{ion}] to the initial concentration [C0][C_0]: \niobs=[Cion][C0]i_{obs} = \frac{[C_{ion}]}{[C_0]} \nIn the context of mass spectrometry, the observed intensity IobsI_{obs} of a molecular ion peak relative to the theoretical intensity ItheoryI_{theory} is related by the factor ii: \nIobs=i⋅ItheoryI_{obs} = i \cdot I_{theory} \nwhere ii accounts for non-ideal solution behavior and incomplete ionization.