Increasing the heating does not increase the evaporation rate at constant temperature, but instead raises the temperature of the liquid until an
increased rate of evaporation (boiling) can balance the rate of heat input. When attempting to separate metals by fractional distillation this
directly translates to less clean separations.
This also suggests to me that the two factors that almost always work in opposition to one another, yield and purity, are even more interdependent for
boiling metal based syntheses.
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