Delta-R
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“Dried over”
I’ve seen “dried over” used to mean drying in a desiccator with the desiccant kept separate from/under the substance, as well as to mean
directly in contact with the substance.
For instance, I’ve seen “dried over H₂SO₄” mean the former and “dried over 3a molecular sieves” mean the latter. Those were pretty
clear, but what about the times where it isn’t so obvious and either way seems reasonable?
Is there a simple way to tell or is it just generally extrapolated from the context?
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mackolol
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What do you mean? Give the example of some phrase, where "dried over" isn't obvious.
When you have a solution in some organic solvent, it's obvious, you're not gonna mess around and put it into desiccator. You just dump the hygroscopic
substance straight into the liquid. Although when you have some wet solid, you rather put it in desiccator.
[Edited on 14-12-2020 by mackolol]
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valeg96
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I believe it's extrapolated from the context. There aren't many ways to dry stuff. Solids, either in an oven or in a closed vessel near (or, over,
like a desiccator) a desiccant. Liquids are usually shaken with the desiccant and decanted, or stored with the desiccant still on the bottom of the
bottle. Gases, you make them flow through a series of rubes packed with the desiccant.
I don't recall any instance in which a solid is dried in contact with some desiccant. Special cases such as an oily product that is forced to solidify
by grinding it with a water-thirsty solvent are mentioned in another way, such as "the oily mass was ground with acetone, and the solid collected".
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