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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: Arachnid2209 on October 31, 2019, 12:38:00 PM

Title: Measuring the equilibrium between an alcohol and its vapour
Post by: Arachnid2209 on October 31, 2019, 12:38:00 PM

Hello,

I recently conducted an experiment where in a closed system, I let an alcohol reach equilibrium with its vapour, so the rate of condensation equals the rate of evaporation. Basically, the air is saturated with the alcohol vapour. I then measured the change in volume of liquid alcohol, and I want some way of expressing the equilibrium. Would you recommend the typical Kc=products/reactants for this or is there a better way of expressing the relationship?

Title: Re: Measuring the equilibrium between an alcohol and its vapour
Post by: mjc123 on October 31, 2019, 02:03:04 PM

The equilibrium in this case is the vapour pressure of the liquid, which is constant at a given temperature.