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Van't Hoff Factor

The Van't Hoff factor (i) accounts for the effect of ionic strength on the retention behavior of ionic compounds in chromatography.
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The statement of the theorem

The Van't Hoff factor ii relates the observed effective concentration CobsC_{obs} to the ideal concentration CidealC_{ideal} for an electrolyte solution undergoing dissociation:\ni=CobsCideali = \frac{C_{obs}}{C_{ideal}} \nFor a solute dissociating into nn ions, the factor ii is theoretically approximated by the number of ions produced, i→ni \to n, accounting for ionic strength effects on retention.
Source: Wikipedia