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I was mixing soup powder with boiling water today and noticed the vapors coming from the water suddenly vanish; seemed like the powder being non volatile decreased the mole fraction of water in the solution and hence lowered the vapor pressure, but I'm skeptical about the reason being hydration enthalpy too.

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    $\begingroup$ There is also factor of cooling down water by addition of cold solid. $\endgroup$
    – Poutnik
    Nov 18 at 13:02

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