So i wanna dissolve different salts in water and measure the vapour pressure of the resulting solution. I am doing this to compare the freezing point depression of different cations, used with the same anion and in the same concen for the experiment, as well a smaller vapour pressure implies greater freezing point depression. How would I go about this? I know the apparatus available to us is a gas pressure sensor but not much about how to utilize it.
Note: If possible, I dont want to use Raoult's Law.