Does 1L of water with salt boil faster or slower than one with the same amount of water but without salt? What I know is that since when you add salt to the water the temperature of boiling increase than the water with salt with take longer.


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  • $\begingroup$ The rate of boiling is dependent on heat influx $\endgroup$ – A.K. Jul 29 '18 at 3:54
  • 2
    $\begingroup$ What doe you mean with “boil faster”? E.g. reaching boiling temperature faster starting from room temperature, or evaporating faster to dryness? $\endgroup$ – Loong Jul 29 '18 at 16:25
  • $\begingroup$ Loong: reaching boiling temperature faster starting from room temperature $\endgroup$ – Giovanni Jul 29 '18 at 21:06

If the heat applied is equal than yes, 1 L of salt water boil slower than 1 L of unsalted water.

If you are intrested you can calculate the diference in boiling point with the formula $\Delta T = K\ b\ i$, where $i$ is the Van't Hoff factor, (2 for the salt NaCl), and $K$ is the ebuliocopic constant of water ($0.512\ \mathrm{^\circ C\ kg\ mol^{-1}}$), and $b$ is the molality of solution.

  • $\begingroup$ Thank you! Yes the same amount of heat is applied. $\endgroup$ – Giovanni Jul 29 '18 at 21:07

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