The Van't Hoff Factor ($i$) accounts for the degree of association or dissociation of a solute.

• Formula for complete dissociation: $i=\text{number of particles after dissociation}$.
• For NaCl (an electrolyte): $NaCl\to N{a}^{+}+C{l}^{-}$
• Since $1$ mole of $NaCl$ yields $2$ moles of ions, for a dilute solution where dissociation is considered complete, $i\approx 2$. This value is used to calculate the 'effective' concentration of particles for colligative properties.