Ebullioscopic constant

In thermodynamics, the ebullioscopic constant, ${\displaystyle K_{\mathrm {b} }}$, allows one to relate molality ${\displaystyle b}$ to boiling point elevation. It is the ratio of the latter to the former:

${\displaystyle \Delta T=i\cdot K_{\mathrm {b} }\cdot b}$
${\displaystyle i}$ is the Vant Hoff factor. It is determined by whether the solute particles in the solution associate or dissociate. If all the particles of the solute trimerise (three associate into one) the Vant hoff factor will be 1/3. If they dissociate into two particles (For example, NaCl as solute which breaks into Na⁺ and Cl⁻), ${\displaystyle i=2}$.

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